steam temperature control is achieved by the use of an __________.

A.high steam pressure in the boiler

B.abnormally high feed-water temperature

C.abnormally high boiler water temperature

D.steam demand exceeding feed pump capacity

Which method should be used to warm up the pump turbines prior to discharge ________．

A.Lock the turbine rotor and slowly bleed in steam until operating temperature is reached

B.Run the pump at high speed with the discharge valves closed

C.Run the turbine at slow speed with the pump disconnected

D.Shut the discharge valve and run the pump at slow speed

Passage Three

Many theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at some time in its very early history became hot enough to melt the materials from which it was formed. While in this molten state, lighter rock-forming materials (造岩材料) floated on the surface of the heavier ones. Then, between four and a half four billion (十亿) years ago, the molten earth cooled sufficiently to form. a crust of rock that was many miles thick.

Surrounding the earth was an unbroken canopy of clouds miles thick and made up mostly of water vapor. Rain falling toward the still-hot earth was heated to steam and rose to the clouds again. After many millions of years, as the earth continued to cool, its surface temperature fell below the boiling point of water. Rainwater could now remain on the earth, covering its whole surface except for the higher places on earth that had been formed from the lighter rock materials.

In 1970, scientists had pieced together evidence that the lighter rock materials had formed one huge continent by a vast ocean. Then, about 200 million years ago, the great continent began to break up, the pieces moving slowly apart.

The onrushing waters of the single huge ocean now entered and filled the spaces between the separating continents--and became the several oceans and seas we know today.

41. This passage mainly talks about ______.

A. the origin of the earth

B. the origin of the ocean

C. the history of the earth

D. the forming of the earth's crust

During the hours when you labor through your work you may say that you are “hot”.That's true.The time of day when you feel most energetic is when your cycle of body temperature is at this peak.For some people the peak comes during the morning.For others it comes in the afternoon or evening.No one has discovered why this is so, but it leads to such familiar words as: “Get up, John! You'll be late for work again!” The possible explanation to the trouble is he is at his temperature-and-energy peak in the evening.Much family quarrelling ends when husbands and wives realize what these energy cycles mean, and which cycle each member of the family has.

You can't change your energy cycle, but you can learn to make your life fit it better.Habit can help, Dr.Kleitman believes.Maybe you're sleepy in the evening but feel you must stay up late anyway.Counteract your cycle to some extent by habitually staying up later than you want to.If your energy is low in the morning but you have an important job to do early in the day, rise before your usual hour.This won't change your cycle, but you'll get up steam and work better at your low point.

Get off to a slow start, which saves your energy.Get up with a leisurely yawn and stretch.Sit on the edge of the bed a minute before putting your feet on the floor.Avoid the troublesome search for clean clothes by laying them out the night before.Whenever possible, do routine work in the afternoon and save tasks requiring more energy for your sharper hours.

1.Dr.Kleitman thinks that （）.

A.getting up late in the morning means laziness

B.if your energy peak is in the evening, you might like getting up early

C.people can do nothing about energy cycle

D.spending some time yawning and stretching helps to keep you energetic

2.According to the passage, family quarrels may result from （）.

A.the same energy cycle of family members

B.unawareness of different energy cycles

C.failing to get up early in the morning

D.knowledge of energy cycles

3.If you are used to getting up late in the morning, you are likely to be most energetic （）.

A.in the morning B.at noon C.in the afternoonD.in the evening

4.What's the likely relationship between energy cycle and body temperature？

A.Energy cycle and body temperature are the same things.

B.The higher your temperature is, the less energetic you are.

C.The higher your temperature is, the more energetic you are.

D.There is no direct relation between them.

5.Which of the following statements is not true？

A.One can change his energy cycle once he makes up his mind.

B.We still don't know why people have different energy cycles.

C.Habit will help to make our life fit energy cycles better.

D.If you rise earlier than usual, you will be more efficient at your low point in the morning.

The Teclrnology Buyer's Guide

Home Control Center

Rex-l0 is a computer controlled mini speaker that acts like a "watchdog" barking when

it detects motion. It' s the perfect protection when you' re out of town. (800-843-532;$ 200)

IBM's Home Director is a multitasking PC that lets homeowners create and run daily routines around

the house. Preset tasks each day or on a weekly basis. Come home to freshly baked apple

pie, a vacuumed house, nearly any wish come true. (800-4267235; $99 and up)

Inteiectron's Lanterns are attractive outdoor lights that turn on at dusk,then switch to full brightness whenever they detect movement. (510-732-6790; $35 to $55)

Park's Temperature Control makes for even daily temperature control and saves up to

20% off a homeowner's energy bill. (800-725-9162; $250 to $375)

Home Entertainment

Via TV Videophone:is just what you need to show the grandparents how the kids are

growing up while talking with them over the phone. The machine works via regular phone

lines (888-843-9898; $550)

Zenith Z32 Color TV is a wide-screen TV that will be the centerpiece of your home

theater. It has just about the sharpest picture at 32 inches (847-39-8100; $ 1,650)

Sennheiser 11D580 Precision Headphones are just what you need to experience crisp

solitary listening. An experience you'll want after a hard day at the office (860-434-9190,

$ 349)

Nintendo 64 is a video-game box guaranteed to give you more thrill than any

action-packed movie (800-255-3700; $ 149)

Kitchen Helpers

Krups Espresso Novo 4000 Programatic coffee maker makes coffee from mild to very

strong. It has a microchip-monitored steam pump. (800-526-5377; $349. 99)

Capresso is the bean grinder-digital coffee maker that should be in everyone's house

You can programme it up to 10 hours so you can depend on fresh coffee anytime

(201-767-3999; $230)

Sharp Multiple Choice Microwave tells you what to put on the plate and how long to cook

it. The digital screen can tell you how to bake apples, cut down on your salt intake, and

much more. (800-be-sharp; $189 to $199)

Panasonic Electronic Rice Cooker not only cooks rice but steams vegetables and has a

fuzzy-logic chip that makes many cooking decisions for you. It can be set 13 hours in advance

to whip up your dinner. (800-366-4308; $ 160 to $170)

Office

Pro-26 Document Shredder, destroys top-secret memos in the comfort of your home.

Two pages can be shredded like spaghetti in seconds. (800-351-7222; $50)

Qulckcam YC 's Videoconterencing via the Net allows you to work at home and let the

office interact with you face-to-face. (800-950-5880; $129)

Brother's MFC Multipurpose Color Printer combines a scanner, copier, fax and digital

answering machine all in one. (800-284-4329; $799)

Kensington Smartsockets' with its co[or-coding system and spaced-out sockets will keep

your plugs untangled. (800-535-4242; $19 to $49)

PanasonIc 6. 6-oz. Combo Cellular allows you to travel far from home and stay in touch

Analog cellular charges kick in when you are 1,000 feet from home. (800-441-7262; $199)

Relaxation

La-z-boy Maxim is a high tech way to recline that lets you catch up on all the sleep

you,ye missed while you are treated to heat and a back massage, all run off a central

computer system. If you can,t take your mind off business, just plug in your laptop to the

armrest phone jack. Better still sit back and enjoy your favorite music with the built-in sound

system, it's got everything you'll need, (800-625-3246; $760 to $850)

Sony Web TV is designed for laid-back Net surfing. Grab hold of Web TV's wireless

keyboard,then you can casually cruise the information highway on the TV, resting the body

without resting the mind (800-772-sony; $200 to $300)

Panasonic Great Escape lets you sit back, relax, and enjoy a shiatsu massage. Great for

relieving stress. (201-348-9090; $2,500 to $3,400)

Transportation

Sandia National Bus Pothole Fixer comes complete with scanners that spot holes cleaners

to clear away debris, and nozzles to shoot filler material in the hole as it drives over, taking

its passengers to their destination. To be commercialized soon

Hypercar is designed to improve car efficiency. It has a scooter sized engine with a gas

turbine cell that provides a constant source of electricity. It is quiet, safe, nearly 95% less

polluting than a conventional car, and gets between 100 and 200 miles per gallon. It is being

tested at the Hypercar Center at the Rocky Mountain Institute

Miscellaneous

Motorola Cow Alert works off a computer chip and a battery. A sensor sits in one of a

cow,5four stomachs ready to alert the farmer within half an hour if a cow falls ill

(Motorola U. S. based)

Heartthrob Brooch not only has 6 rubies and 78 diamonds but carries a chip-controlled

light-emitting device that flashes with each beat of the wearer's heart. (M. I T. Media Lab

designer Harry Winston; $400,000)

Sole Attraction is a new sneaker that takes vital information from potential mates. All

you do is shake hands and exchange the necessary information, then let the sneakers do the

rest. Provided both of you are wearing them, a low-level electric current races along your

skin's surface and onto your partner,s, coding details on a computer chip on the soles of the

sneakers. (designed by Massachusetts Institute of Technology(M. I . T), U. S)

Questions 11-20 are based on Passage 2

11. The IBM Home Director's unit uses a ___________ to run the home

A. dog's bark B. multitasking PC

C. video phone

12. Park, s Temperature Control is reported to save up to ______________ percent of energy bills

A.50 B.1O

C. 20

13. The Zenith Z32 comes with a ______________.

A. wide screen TV ？ B. phone

C. home theater

14. Krups Espresso makes different types of coffee but the Capresso has a _________.

A. timer B. steam pump

C. storage filter

15. Kensington Smartsockets lets you ________.

A. interact with your boss B. organize your plugs

C. shred documents

16. The Panasonic Great Escape machine lets you enjoy a _________________.

A. phone jack B. music system

C. shiatsu massage

17. The Hypercar is designed to be _____________.

A. safe and efficient B. Powerful and noisy

C. cheap and easy to repair

18. Farmers can find out when a cow _________ with the Motorola Cow Alert

A. needs milking B. is sick

C. is missing

19. The Heartthrob Brooch flashes when _____________.

A. the heart beats B. love stimulates the jewels

C. the light is dim

20. The sole Attraction sneakers work off _____________.

A. heart beats B. an electric current

C. a timed response

During the hours when you labor through your work you may say that you're "hot". That's true. The time of day when you feel most energetic is when your cycle of body temperature is at its peak. For some people the peak comes during the forenoon. For others it comes in the afternoon or evening. No one has discovered why this is so, but it leads to such familiar monologues as: "Get up, Peter! You'll be late for work again!" The possible explanation to the trouble is that Peter is at his temperature-and-energy peak in the evening. Much family quarrelling ends when husbands and wives realize what these energy cycles mean, and which cycle each member of the family has.

You can't change your energy cycle, but you can learn to make your life fit it better. Habit can help, Dr. Kleitman believes. Maybe you're sleepy in the evening but feel you must stay up late anyway. Counteract your cycle to some extent by habitually staying up later than you want to. If your energy is low in the morning, but you have an important job to do early in the day, rise before your usual hour. This won't change your cycle, but you'll get up steam and work better at your low point.

Get off to a slow start which saves your energy. Get up with a leisurely yawn and stretch. Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the troublesome search for clean clothes by laying them out the night before. Whenever possible, do routine work in the afternoon and save tasks requiring more energy or concentration for your sharper hours.

If a person finds getting up early a problem, most probably ______.

A．he is a lazy person

B．he refuses to follow his own energy cycle

C．he is not sure when his energy is low

D．he is at his peak in the afternoon or evening

In the modern technology world, the sea offers many resources to help mankind survive.Resources on land are beginning to grow less.The sea, however, still offers hope to supply many of man’s needs in the future.

The riches of the sea yet to be developed by man’s technology are impressive.Oil and gas explorations have existed for nearly thirty years.Valuable amounts of minerals such as iron, copper and so on exist on the ocean floor.

Besides oil and gas, the sea may offer new sources of energy.For example, warm temperature of the ocean can be used as the steam in a steamship.Sea may also offer a source of energy as electricity for mankind.

Technology is enabling man to explore even deeper under the sea.It is obvious that the technology to harvest the sea continues to improve.By 2050, experts believe that the problems to explore the food,

minerals and energy resources of the sea will have been largely solved.

26.What is the proper title for the passage______

A.Needs of Man

B.Sea Harvest and Food

C.Sea and Sources of Energy

D.Sea Exploring Technology

27.It can be inferred from the passage that______

A.man hasn’t completely made use of the riches of the sea

B.technology for exploring the sea has been solved

C.harvesting rice in the sea will be made possible

D.in the near future man can live on the ocean floor

28.Why does the author mention a steamship______

A.To illustrate that man can make use of sources of energy from the sea

B.To show that a steamship is better than other kinds of ships

C.To argue that man should use steamships

D.To indicate that it is warmer in the ocean than on land

29.According to the author, technology is important because______

A.resources on land are running short in ten years

B.man can use it to explore the deeper sea

C.it is a lot of fun diving into the sea

D.ancient people used it to explore the sea

30.According to the author, when will the problems to explore the deeper sea largely be solved______

A.In the next generation

B.By the end of the 20th century

C.In the near future

D.By the middle of the 21st century

根据下列文章,请回答 31～35 题。

Text 3

Do you find it very difficult and painful to get up in the morning？ This might be called laziness,but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle.

During the hours when you labor through your work you may say that you' re "hot'. That' s true. The time of day when you feel most energetic is when your cycle of body temperature is at its peak. For some people the peak comes during the forenoon. For others it comes in the afternoon or evening. No one has discovered why this is so, but it leads to such familiar monologues as: "Get up, Peter! You'll be late for work again!" The possible explanation to the trouble is that Peter is at his temperature-and-energy peak in the evening. Much family quarrel ends when husbands and wives realize what these energy cycles mean, and which cycle each member of the family has.

You can' t change your energy cycle, but you can learn to make your life fit it better. Habit can help, Dr. Kleitman believes. Maybe you' re sleepy in the evening but feel you must stay up late any- way. Counteract your cycle to some extent by habitually staying up later than you want to. If your energy is low in the morning, but you have an important job to do early in the day, rise before your usual hour. This won' t change .your cycle, but you' 11 get up steam and work better at your low point.

Get off to a slow start which saves your energy. Get up with a leisurely yawn and stretch. Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the troublesome search for clean clothes by laying them out the night before. Whenever possible, do routine work in the afternoon and save tasks requiting more energy or concentration for your sharper hours.

第 31 题 If a person finds getting up early a problem, most probably

A．he is a lazy person

B．he refuses to follow his own energy cycle

C．he is not sure when his energy is low

D．he is at his peak in the afternoon or evening

Questions are based on the following passage．

Do you find getting up in the morning so difficult that it's painful？ This might be called laziness, but Dr．Kleitman has a new explanation． He has proved everyone has a daily energy cycle．

During the hours when you labor through your work you may say that you're "hot．" That's true． The time of day when you feel most energetic is when your cycle of body temperature is at its peak (顶峰)． For some people, the peak comes during the forenoon． For others it comes in the afternoon or evening． No one has discovered why this is so, but it leads to such familiar monologues (自言自语) as: "Get up, John． You'll be late for work again．" The possible explanation to the trouble is that John is at his temperature-and-energy peak in the evening．

(80) Much family quarrelling ends when husbands and wives realize what these energy cycles mean and which cycle each member of the family has．

You can't change your energy cycle, but you can learn to make your life ftt it better． Dr． Kleitman believes that habit can help． Maybe you're sleepy in the evening but feel you must stay up late anyway． Counteract (对抗) your cycle to some extent by habitually staying up later than you want． If your energy is low in the morning but you have an important job to do early in the day, rise before your usual hour． This won't change your cycle, but you'll get up steam (振作精神)and work better at your low point．

Get off to a slow start which saves your energy． Get up with a leisurely yawn (打哈欠)and stretch． Sit on the edge of the bed a minute before putting your feet on the floor． Avoid the troublesome search for clean clothes by laying them out the night before． Whenever possible,do routine work in the afternoon and save tasks requiring more energy or concentration for your sharper hours．

According to the writer， if a person finds getting up early a problem，most probably__________ 查看材料

A.he refuses to follow his own energy cycle

B.he is a lazy person

C.he is not sure when his energy is low

D.he is at his peak in the afternoon or evening