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There are many places in the world which are short of fresh water. Therefore, many countries are trying to find ways to turn sea water into fresh water. People build many factories to make salt water into fresh.

In some places, people use some ways to heat sea water. These ways will turn salt water into fresh water, but these ways cost much money. Sometimes, people boil sea water with high heat, then a lot of fresh water can be made quickly.

However, heating is not the only way to get fresh water from salt water. Other ways are tried. One way is freezing. The fresh part of salt water freezes first. To get fresh water, the pieces of ice are taken out.

Which method is best? The one that gives the most water for the least money. It may be a different way for each place.

Heating seems very good for small, hot places. It doesn't make very much water at a time and the quality of fresh water is not so good. But the factory is easy to build and costs little. That's why people in many dry places still use this method!

1.What does the passage mainly talk about?

A Hot places and dry places.

B Water factories in different countries.

C How to make good use of the sunlight.

D The ways of making fresh water from sea water.

解析：选D。主旨大意题。根据全文可知，文章主要讲述了将海水变成淡水的方法，故选D。

2.Why do many countries try to turn salt water into fresh water?

A People like fresh water.

B People don’t like salt.

C They are short of fresh water.

D They are short of salt water.

解析：选C。细节理解题。根据第一段第一句There are many places in the world which are short of fresh water.可知世界上有许多地方缺乏淡水，故选C。

3.How do people get fresh water?

A Cut woods.

B Cook fresh meat.

C Build high buildings.

D Boil sea water with high heat.

解析：选D。细节理解题。根据第二段第一句In some places, people use some ways to heat sea water.可知人们用一些方法加热海水来得到淡水，故选D。

4.Which is the best way for small and hot places to get fresh water?

A Making wishes.

B Drawing the sea and sky.

C Boiling or heating the sea water.

D Freezing the sea water in cold places.

解析：选C。细节理解题。根据最后一段第一句Heating seems very good for small, hot places.可知加热的方法对小而热的地方似乎很好，故选C。

5.Which of the following is TRUE?

A People are trying to get fresh water.

B Water factories doesn't work in dry places.

C A lot of fresh water can be made quickly by heating.

D The best way is to get the least fresh water with the most money.

解析：选A。细节理解题。根全文可知人们尝试将海水变为淡水，故选A。