题目内容：

Many places in the world need more fresh (淡的）water. Every country is trying to find ways to turn salt water into fresh. Why aren't there many factories like the Symi factory?

In some places，the sun isn’t hot enough，or it doesn’t shine every day. In these places, other ways of heating sea water can be used. These ways cost more money, but they work faster than the sun. By boiling (煮沸）sea water with high heat, a lot of fresh water can be made quickly.

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

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

Symi’s way seems very good for small，hot places, It doesn’t make very much water at a time，but the factory is easy to be built and doesn’t cost a lot!

That’s why people in many dry places talk about Symi!

1.From the passage we know that fresh water ___________.

A. can be used in many ways B. is needed in every country

C. is needed in many countries D. is very important for factories

2.The Symi factory _________.

A. is a fresh water-making factory B. can be built everywhere

C. doesn’t need sunshine every day D. can make much fresh water at a time

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

A. Freezing the sea water in cold places. B. Boiling or heating the sea water.

C. The way in sunny places. D. The Symi’s way.

4.The writer is mainly talking about _______.

A. water-making factories in different countries

B. how to make good use of the sunlight

C. the ways of making fresh water from sea Water

D. hot places and dry places

5.Which of the following is NOT true?

A. New ways are tried to get fresh water.

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

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

D. The Symi's way doesn't work in dry places.