The world is not hungry , but it is thirsty . It seems strange that nearly 3/4 of the earth is covered with water while we say we are short of (短缺) water. Why? Because about 97% of water on the earth is sea water which we can't drink or use for watering plants directly (直接地) . Man can only drink and use the 3% - the water that comes from rivers and lakes. And we can't even use all of that, because some of it has been polluted (污染) .

Now more water is needed. The problem is: Can we avoid (避免) a serious water shortage later on? First, we should all learn how to save water. Secondly, we should find out the ways to reuse it . Scientists have always been making studies in the 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 (即使) every large city reused its water, still there would not be enough. What could people turn to next?

The sea seems to have the best answer. There is a lot of water in the sea. All that needs to be done is to get the salt out of the sea water. This is expensive, but it's already used in many parts of the world. Scientists are trying to find a cheaper way of doing it. So you see, if we can find a way out, we'll be in no danger of drying up.

1.The world is thirsty because ________.

A. 3/4 of the earth is covered with water

B. we have enough sea water to use directly

C. we haven't used all the water in rivers and lakes

D. about 97% of water on the earth can't be drunk or used for watering plants directly

2.Which of the following is true ?

A. 3% of water on the earth is in rivers and lakes.

B. 75% of water on the earth is the sea.

C. 97% of the earth is covered with water.

D. 3% of water on the earth is sea water.

3.From the passage we learn _________.

A. if every city reuses its water, we'll be in no danger of drying up

B. man can only drink and use about 25% of water on the earth

C. today in most large cities water is used only once

D. water can be used only once

4.To avoid the serious water shortage , which of the following is the most important?

A. Save water and try to make good use of the water in rivers and lakes.

B. Don't pollute water and keep all rivers and lakes clean.

C. Make dirty water clean and then reuse it.

D. Try to find a cheaper way to get the salt out of the sea water.

5.The name of the passage would be ________

A. The Sea Water B. How to Save Water

C. The Thirsty World D. The Polluted Water

Mary was an operator(接线员)911in Los Angeles.One Thursday morning,she was surprised to get a call from a young child who said,“Mom my ill,Mom my ill, ” again and again.Mary hurried to find the address of the call.She called the police,in a minute,the policemen and doctors arrived at the house.They broke the door open,they couldn't believe their eyes.The little child was so young that maybe she could not walk!She was sitting beside her mother and holding her mother’s hand.Tears(眼泪)were running down her face. The doctors gave the woman some medicine and soon she woke up.Later,she told people,“Everyone was surprised that my daughter could call 911.One Monday I tried to teach her how to call 911,but she couldn’t do it.”Mary was surprised,too.“It’s the first time I’ve seen a two-year-old child call 911.”

1.What did Mary do every day?

A.She answered the telephone calls.

B.She talked with the policemen and the doctors.

C.She played with the children.

D.She dealt with emergencies(紧急情况).

2.How did she feel when she answered the little girl’s call?

A.She was worried. B.She was sorry.

C.She was surprised. D.She was happy.

3.How did the police and the doctors get into the house?

A.They went in through the windows.

B.They broke the door open.

C.They didn't go in.

D.The women was outside.They didn't need to go in.

4.How could the little girl learn to call 911?.

A.She learnt it by herself.

B.She called it by chance(偶然地).

C.Her mother taught her one Monday.

D.Her mother often taught her.

5.How old was the little girl?

A.Only two.

B.She was nine.

C.She was five.

D.She couldn’t walk, so she must be less one.

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