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。

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。

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

F. And we can’t even use all of that.

阅读下面短文，然后根据短文内容回答问题。

　　When we think of money, we think of coins and paper bills. That is what money is today. But in the past people used many things instead of money. Some countries used cows. Other countries used salt, tobacco(烟草), or stones. Today there are still some places in the world that do not use paper money. One place is the island of Yap in the Pacific Ocean.

　　On the island of Yap, people use the heaviest money in the world－Yap stones. These are round, white stones with a hole in the middle. The Yap stones do not originate(起源) from the island. The Yap men have to go to islands four hundred miles away to get them. Big stones can be twelve feet high－as big as two tall men. Small stones are as big as a dinner plate.

　　Rich people do not carry the Yap stones. Servants(仆人) Follow the rich. Each servant carries a stone on a long stick over his shoulder(肩膀). Today the people on the island use paper money for everyday shopping. But for other things they still prefer Yap stones.

1．What is money today?

2．What did people use instead of money in the world in the past?

3．Where do people on the island of Yap get Yap stones?

4．What do Yap stones look like?

5．What do the Yap men buy with Yap stones today?

— You’d better not eat too much salt. It’s bad for your health.

—_________.

A. Not at all　　　　　　　　　　　　　　　 B. You’re welcome　　

C. It doesn’t matter　　　　　　　　　　 D. Thanks for your advice