Without water, human ______ ．

Many people don't know how ___3___ water the human body needs to work well, and many people do not drink enough,___4___in hot weather. Our body is mostly water about 67%--75%. If we don't have enough, we'll feel ___5___ and many will get ill. So, you know, how important the water is to us all.

1)、A.much

B.tired

C.even

D.true

E.drink

2)、A.much

B.tired

C.even

D.true

E.drink

3)、A.much

B.tired

C.even

D.true

E.drink

4)、A.much

B.tired

C.even

D.true

E.drink

5)、A.much

B.tired

C.even

D.true

E.drink

Questions are based on the following passage.

Salt is as necessary to life as water. In many areas of Africa people once drank the urine (尿）

of animals because they had no other source of salt. Without salt, human beings die.

The human body demands that the amount of salt in the blood always stay the same. When the body does not get enough salt, it protects itself by letting less salt leave the body in urine and sweat. But it carmot reduce this output to zero. Some salt is always escaping. On a complete saltless diet, like that of some people in Africa, the body steadily loses small amounts of salt through the kidneys (肾) and sweat glands (腺）It then tries to adjust to this loss by speeding its secretion (分泌) of water. (78) In this way, the body attempts to keep the amount of salt in the blood at the necessary level. The result is a slow drying up of body and,inally,death. The person dies of thirst.

In cases where there is little or no water to drink, the body tries to do the opposite thing. Again, it must keep the salt level in the blood constant. Because it has little water, it attempts to stop water from leaving the body and to increase its secretion of salt. But, as with the escaping salt, it cannot be completely successful. Some water still leaves and the person eventually dies of thirst. In short, the body's normal needs for salt and for water are both parts of the same important need to keep the salt level in the blood constant.

Some African people once drank animal urine __________ 查看材料

A.when they were going to die

B.because they were thirsty

C.because there was little salt

D.because they were short of water

Questions are based on the following passage．

In fact， even without humans， the Earth"s climate changes．Some climate change is（36）But，as greenhouse gases are added to the atmosphere， human influence "emerges" from natural variability．Droughts， one of the most Intensely studied climate events， are a perfect example of an（37）with both natural and human influences．Separating the（38）strengths of the influences is a challengefor scientists．However， with the large social and economic costs of droughts， it is a challenge thescientists must（39）.

In a very recent study published in the Journal of Climate， authors Richard Seager and MartinHoerling cleverly used climate models forced by sea surface temperatures to（40）how much of thepast century"s North American droughts have been caused by ocean temperatures， natural variability and human influences．

Droughts can be caused by a （n）（41）of separate or interactional phenomena．At its root，drought results from the low（42）of water falling and sometimes higher temperatures （which increaseevaporation rates）．The beginning of drought can often be linked to variations in ocean temperatures．

It is also found that the oceans can affect the atmosphere to create conditions that are（43）responsible for drought．What"s more， temperature increases（44）withhuman-driven global warmingalso play a role．This（45）agrees with other researchers who have shown that， while human-emittedgreenhouse gas warming may not cause a particular drought， it can make drought come on earlier，faster， and harder than it otherwise would．

A．associated

B．attached

C．conclusion

D．conduct

E．distinguish

F．effect

G．natural

H．Partly

I．Quality

J．Quantity

K．Relative

L．Ridiculous

M．Simply

N．Undertake

O．variety

第（36）题应填__________ 查看材料

Another strategy of large desert animals is to tolerate the loss of body water to a point that would be fatal for non-adapted animals. The camel can lose up to 30 percent of its body weight as water without harm to itself, whereas human beings die after losing only 12 to 13 percent of their body weight. An equally important adaptation is the ability to replenish (Sheik) this water loss at one drink. Desert animals can drink huge volumes in a short time, and camels have been known to imbibe (吸收) over 100 liters in a few minutes. A very dehydrated person, on the other hand, cannot drink enough water to rehydrate at one session, because the human stomach is not sufficiently big and because a too rapid dilution of the body fluids causes death from water intoxication. The tolerance of water loss is of obvious advantage in the desert, as animals do not have to remain near a water hole but can obtain food from grazing sparse pastures. Desert-adapted mammals have the further ability to feed normally when extremely dehydrated, it is a common experience in people that appetite is lost even under conditions of moderate thirst.

What is the passage mainly about？

A．Animals developed different strategies to survive.

B．Large animals can take strategies to reduce the effect of extreme heat.

C．Animals can tolerate the loss of body water.

D．A very dehydrated person can drink enough water to rehydrate.

根据下面内容，回答题：

Earth is the only 21 we know of in the universe that can support human life.22 human activities are making the planet less fit to live on. As the western world 23 on consuming two-thirds of the world" s resources while half of the world" s population do so 24 to stay alive we are rapidly destroying the 25 resource we have by which all people can survive and prosper.

Everywhere fertile soil is 26 built on or washed into the sea. Renewable resources are exploited so much that they will never be able to recover 27 We discharge pollutants 28 the atmosphere without any thought of the consequences. As a 29 the planet" s ability to support people is being 30 at the very time when rising human numbers and consumption are 31 increasingly heavy demands on it. The Earth" s 32 resources are there for us to use. We need food， water， air， energy， medicines， warmth， shelter and minerals to 33 us fed， comfortable， healthy and active. If we are sensible in how we use the resources they will 34 indefinitely. But if we use them wastefully and excessively they will soon run 35 and everyone will suffer.

材料题请点击右侧查看材料问题 查看材料

A.situation

B.place

C.position

D.site

Today we live in a world where GPS systems, digital maps, and other navigation apps are available on our smart phones. 1 of us just walk straight into the woods without a phone. But phones 2 on batteries, and batteries can die faster than we realize. 3 you get lost without a phone or a compass, and you 4 can’t find north, a few tricks to help you navigate 5 to civilization, one of which is to follow the land... When you find yourself well 6 a trail, but not in a completely 7 area, you have to answer two questions: Which 8 is downhill, in this particular area？ And where is the nearest water source？ Humans overwhelmingly live in valleys, and on supplies of fresh water. 9 , if you head downhill, and follow any H2O you find, you should 10 see signs of people. If you’ve explored the area before, keep an eye out for familiar sights—you may be 11 how quickly identifying a distinctive rock or tree can restore your bearings. Another 12 : Climb high and look for signs of human habitation. 13 , even in dense forest, you should be able to 14 gaps in the tree line due to roads, train tracks, and other paths people carve 15 the woods. Head toward these 16 to find a way out. At night, scan the horizon for 17 light sources, such as fires and streetlights, then walk toward the glow of light pollution. 18 , assuming you’re lost in an area humans tend to frequent, look for the 19 we leave on the landscape. Trail blazes, tire tracks, and other features can 20 you to civilization. 1.

A、Some

B、Most

C、Few

D、All

________ human beings ________ animals can live without air.

A.Not only…but also

B.Both…and

C.Either…or

D.Neither…nor

On no account ______ proceed without pilot in this water area．

A.the vessel

B.shall not vessel

C.the vessel should

D.should vessel

A.late

B.continue

C.last

D.survive