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The world is not hungry，but it’s thirsty. 1 while we say we are short of water.Why？Because about 97% of water on the earth is sea water which we can‘t drink or use for watering plants directly.Man can only drink and use the 3% of water that comes from rivers and lakes. 2 ，because some of it has been polluted.
　　Now more water is needed.The problem is how we can avoid a serious water shortage in the future. 3 Scientists are making study in this field.Today，In most large cities water is used only once and then runs to the sea or rivers.but it can be used again.Even if every large city reused its water，the water will still not be enough. 4 .
　　The sea seems to give us the best answer.There is a lot of water in the sea.All that needs to be get the salt out of the sea water.This will be expensive，but it has already been used in many parts of the world. 6 So you see，if we can find out a way，we’ll be in no danger of drying up.
从方框中所给的选项中选出能填入空白处的最佳选项，补全短文。其中有一项为多余选项。

任务型阅读

　　For a long time, scientists didn’t study animal thinking．Most of them did not believe that animals could think．They thought humans were the only thinking animals．

　　Now more scientists are studying this subject．But it’s very hard to prove things that no one can see or measure．So some scientists decided to take a look at brains．

　　Is bigger better?No．Cow brains are bigger than dog brains, but that doesn’t make cows smarter than dogs．And squirrels have some of the biggest brains of all for their body size．But squirrels aren’t even close to being the smartest animals in the world．So the size of a brain may give some clues(线索)about brain power, but it doesn’t prove anything．

　　Other scientists study thinking by ________ how animals solve problems．They watch animals in the wild or do thinking tests in a lab．

　　For example, the scientist might put some food just out of an animal’s reach．One kind of animal may grab a stick and use it to slide the food over．Another kind might not be able to figure out a way to get the food．Some scientists think animals that have lots of problems to solve must be smarter than animals with simple lives．Scientists also study certain kinds of behaviour for clues about thinking．They watch for three things：whether animals use tools, how they act with each other, and how they communicate．

1．“This subject” in Paragraph 2 refers to ________．

2．The underlined word “smarter” means ________ in English．(限填一词)

3．What have scientists learned from studying the size of animals’ brains?

________________________________

4．Complete the sentence with just one word：Other scientists study thinking by ________ how animals solve problems．(限填一词)

5．Scientists study such animals’ behavior as whether animals use tools, how they act with each other and ________ as well．

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The world is not hungry，but it’s thirsty. 1 while we say we are short of water.Why？Because about 97% of water on the earth is sea water which we can‘t drink or use for watering plants directly.Man can only drink and use the 3% of water that comes from rivers and lakes. 2 ，because some of it has been polluted.

　　Now more water is needed.The problem is how we can avoid a serious water shortage in the future. 3 Scientists are making study in this field.Today，In most large cities water is used only once and then runs to the sea or rivers.but it can be used again.Even if every large city reused its water，the water will still not be enough. 4 .

　　The sea seems to give us the best answer.There is a lot of water in the sea.All that needs to be get the salt out of the sea water.This will be expensive，but it has already been used in many parts of the world. 6 So you see，if we can find out a way，we’ll be in no danger of drying up.

从方框中所给的选项中选出能填入空白处的最佳选项，补全短文。其中有一项为多余选项。

A．Scientists are trying to find a cheaper way of doing it.

B．It seems strange that nearly 3/4 of the earth is covered with water.

C．What could people do next?

D．We should use all the water directly.

E. First, we should find out ways to reuse it.

F. And we can’t even use all of that.

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The world is not hungry，but it’s thirsty. 1 while we say we are short of water.Why？Because about 97% of water on the earth is sea water which we can‘t drink or use for watering plants directly.Man can only drink and use the 3% of water that comes from rivers and lakes. 2 ，because some of it has been polluted.
　　Now more water is needed.The problem is how we can avoid a serious water shortage in the future. 3 Scientists are making study in this field.Today，In most large cities water is used only once and then runs to the sea or rivers.but it can be used again.Even if every large city reused its water，the water will still not be enough. 4 .
　　The sea seems to give us the best answer.There is a lot of water in the sea.All that needs to be get the salt out of the sea water.This will be expensive，but it has already been used in many parts of the world. 6 So you see，if we can find out a way，we’ll be in no danger of drying up.
从方框中所给的选项中选出能填入空白处的最佳选项，补全短文。其中有一项为多余选项。

A．Scientists are trying to find a cheaper way of doing it.

B．It seems strange that nearly 3/4 of the earth is covered with water.

C．What could people do next?