The cell walls of red and white blood cells are
semi-permeable mem-branes.The concentration of solute particles in the blood is about
0.60mol·L-1.What hap-pens to blood cells that are placed in pure water？
What happens when it in a1mol·L-1so-dium chloride solution？
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更多“The cell walls of red and whit…”相关的问题
第3题
A.Systemimformation
B.RRC connention Release
C.RRC connention Setup
D.Inheriting form. another RAT at inter-RAT cell(re)selection
第4题
Part A
Directions: Read the following three texts. Answer the questions on each text by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1.
Medicine comes in many forms. In its liquid form, medicine affects the body very quickly. But the effects of liquid medicine arch' t usually long-lasting. This is why pills and capsules (胶囊) are also used.
The pills and capsules being sold today arch' t perfect, either. Pills dissolve in the stomach. The medicine in the pills is released when the pills dissolve. But often, the pills dissolve too quickly.
Scientists have been trying to develop a pill that can release medicine slowly over a long period of time. They have applied their knowledge of plants to produce the "osmotic (渗透的) pump pill".
The cell walls of plants are made of cellulose (纤维素). Cellulose is a very porous substance. Their holes are big enough to allow water through the cell walls. As water enters a cell, pressure builds up in the cell. The pressure pumps other substances out of the cell. These substances leave the cell through the cellulose wall. This slow, steady process is called osmosis.
The osmotic pump pill is coated with synthetic cellulose. Liquid medicine is contained in the pill. The holes in the cellulose coating of the pill are big enough to allow water in the pill. As water from the body enters the pill, pressure builds up in the pill. The medicine is then slowly pumped out of the pill.
The passage implies that the osmotic pump pill is better than other pills and capsules because______.
A．it releases medicine slowly over a long period of time
B．it helps to build pressure in the body
C．the medicine in the pill can affect the body quickly
D．the coating doesn't dissolve in the stomach
第5题
Common Problems, Common Solutions
The chances are that you made up your mind about smoking a long time ago and decided it's not for you.
The chances are equally good that you know a lot of smokers — there are, after all about 60 million of them, work with them, and get along with them very well.
And finally it's a pretty safe bet that you're open-minded and interested in all the various issues about smokers and non-smokers — or you wouldn't be reading this.
And those three things make you incredibly(难以置信的) important today.
Because they mean that yours is the voice — not the smoker's and not the anti-smoker's — that will determine how much of society's efforts should go into building walls that separate us and how much into the search for solutions that bring us together.
For one tragic result of the emphasis on building walls is the diversion(转移) of millions of dollars from scientific research on the causes and cures of diseases which, when all is said and done, still strike the nonsmoker as well as the smoker. One prominent(卓越的) health organization, to cite(引证) but a single instance, now spends 28 cents of every publicly contributed dollar on "education" (much of it in antismoking propaganda)and only 2 cents on research.
There will always be some who want to build wails, who want to separate people from people, and up to a point, even these may serve society. The anti-smoking wall-builders have, to give them their due, helped to make us all more keenly aware of choice.
But our guess, and certainly our hope, is that you are among the far greatest number who know that walls are only temporary(暂时的) at best, and that over the long run, we can serve society's interest better by working together in mutual accommodation.
Whatever virtue walls may have, they can never move our society toward fundamental solutions. People who work together on common problems, common solutions, can.
What does the word "wall" used in the passage mean？
A．Anti-smoking propaganda.
B．Diseases striking nonsmokers as well as smokers.
C．Rules and regulations that prohibit smoking.
D．Separation of smokers from nonsmokers.
第6题
16. From the passage, we know that mobile homes _______.
A. can be built better than our homes
B. need to move all the time
C. can provide something people need
D. must stand only high on a hill
17. _______ is one of the reasons for people to choose mobile homes.
A. The job uncertainty
B. The strange design
C. The low price
D. The high speed
18. Which of the following may NOT attract people to buy mobile homes？
A. The new model appears every year.
B. Walls can be easily built around them.
C. They don't need to be painted.
D. They can be moved here and there.
19. We can infer that the increase of the mobile homes shows _______.
A. great changes in people's living style. (方式)
B. great interest in developing new things
C. some problems in people's life
D. people's hope for new jobs
20. Which of the following is the best title for the passage？
A. How to Choose a Mobile Home
B. The Developing Mobile Homes
C. The Uses of Mobile Homes
D. Mobile Homes Are Popular in the US
第7题
A bunch of behavior sensors and a clever piece of software could do just that,by analyzing your behavior to determine if it's a good time to interrupt you.If built into a phone,the system may decide you're too busy and ask the caller to leave a message or ring back later.
James Fogarty and Scott Hudson at carnegie Mellon University in Pennsylvania based their system on tiny microphones,cameras and touch sensors that reveal body language and activity.First they had to study different behaviors to find out which ones strongly predict whether your mind is interrupted.
The potential"busyness"signals they focused on included whether the office doors were left open or closed,the time of day,if other people were with the person in question,how close they were to each other,and whether or not the computer was in use.
The sensors monitored these and many other factors while four subjects were at work.At random intervals，the subjects rated how interruptible they were on a scale ranging from"highly interruptible"to"highly not interruptible".Their ratings were then correlated with the various behaviors."It is a shotgun approach.we used all the indicators we could think of and then let statistics find out which were important,"says Hudson.
The model showed that using the keyboard,and talking on a landline or to someone else in the office correlated most strongly with how interruptible the subjects judged themselves to be.
Interestingly,the computer was actually better than people at predicting when someone was too busy to be interrupted.The computer got it right 82 per cent of the time,humans 77 per cent.Fogarty speculates that this might be because people doing the interrupting are inevitably biased towards delivering their message,whereas computers don't care.
The first application for Hudson and Fogarty's system is likely to be in an instant messaging system,followed by office phones and cell phones."There is no technological roadblock to it used in a couple of years,"says Hudson.
1.A big problem facing people today is that（）.
A、they must tolerate phone disturbances or miss important calls
B、they must turn off their phones to keep their homes quiet
C、they have to switch from a desktop phone to a cell phone
D、they are too busy to make phone Calls or write e-mails
2.The behavior sensor and software system built in a phone（）.
A、could help store important messages
B、could send messages immediately
C、could tell when it's right to itererupt you
D、could refuse important phone calls
3.Scientists at Carnegie Mellon University tried to find out（）.
A、why office doors were often 1eft open
B、when it was a good time to turn off the computer
C、what questions office workers were bothered with
D、which behaviors could tell whether a person was busy
4. During the experiment, the subjects were asked （）
A、to control the sensors and the camera
B、to rate the degrees to which they could be interrupted
C、to compare their behaviors with one another's
D、to analyze all the indicators of nterruption
5. The computer performed better than people in the study because（）.
A、the computer worked harder
B、the computer was not busy
C、people tended to be biased
D、people were not good at statistics
第8题
children. Researchers __(1)__ that Gen N’s are more individualistic. They want their own personal space and freedom. This is resulting __(2)__ many people choosing to marry later, or not at all. One marketing and research company discovered the__(3)__attitude among Gen N’s: There’s no need to marry if you can lead a happy and independent life __(4)__ . For those __(5)__ do marry, they’re waiting until they’re older. They’re also choosing to have children later. Many Gen N’s come __(6)__ homes where both parents work. This has made them the generation with more disposable income than any other. And marketers haven’t lost __(7)__ of this fact. These days, __(8)__ from cell phones to credit cards is marketed directly toward Generation N. As a group, they enthusiastically welcome rapidly changing technology. And they eagerly buy and use the newest products. Unfortunately, Gen N’s also have a great willingness to buy on credit. They worry __(9)__about going __(10)__ debt than previous generations.
(1)、A、said
B、says
C、stated
D、state
(2)、A、in
B、to
C、for
D、from
(3)、A、followed
B、follows
C、following
D、follow
(4)、A、lonely
B、lone
C、alone
D、along
(5)、A、that
B、which
C、whom
D、who
(6)、A、from
B、in
C、out
D、of
(7)、A、view
B、sight
C、vision
D、idea
(8)、A、anything
B、nothing
C、something
D、everything
(9)、A、more
B、much
C、less
D、little
(10)、A、to
B、into
C、on
D、for
第9题
About 9:30 we went to the White House. It's【76】the public from 10【77】12, and there was a long line of people【78】to get in. We didn't have to wait very long, because the line moved pretty quickly.
The White House is really white. It【79】every year. And it seems very white, because it's got beautiful lawns【80】around it, with many trees and shrubs. The grounds【81】about four square blocks. I mean, they're about two blocks long【82】each side.
Of course, we didn't see the whole building. The part【83】the President lives and works is not open to the public. But the part we saw was beautiful. We went through five of the main rooms. One of【84】was the library, on the ground floor. On the next floor, there are three rooms named【85】the colors that are used in them: the Red Room, the Blue Room, and the Green Room. The walls are covered with silk【86】. There are【87】old furniture, from the time【88】the White House was【89】built. And everywhere there are paintings and statues of former presidents and【90】famous people from history.
(71)
A．made
B．took
C．did
D．set
第10题
About 9:30 we went to the White House. It's【61】the public from ten【62】twelve, and there was a long line of people【63】to get in. We didn't have to wait very long, because the line moved pretty quickly.
The White House is really white. It【64】every year. And it seems very white, because it's got beautiful lawns【65】around it, with many trees and shrubs. The grounds【66】about four square blocks. I mean, they' re about two blocks long【67】each side.
Of course, we didn't see the whole building. The part【68】the president lives and works can not be visited by the public. But the part we saw was beautiful. We went through five of the main rooms. One of【69】was the library, on the ground floor. On the next floor, there are three rooms named【70】the colors that are used in them: the Red Room, the Blue Room, and the Green Room. The walls are covered with silk【71】There are【72】old furniture, from the time【73】the White House was【74】built. And everywhere there are paintings and statues of former presidents and【75】famous people from history.
(56)
A．made
B．took
C．did
D．set
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