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 usd． These ways cost more money, but they work faster than the sun. By boiling 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 trid． One way is freezing. The fresh part of salt water freezes first. To get fresh water, the pieces of ice are taken out.

Which way is 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 build and cost little.

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

1．From the passage we know that fresh water________. (　)

A．is needed in many countries

B．is needed in every country

C．can be used in many ways

D．is very important for factories

2．The Symi factory ________. (　)

A．is a fresh-water factory

B．can be built everywhere

C．doesn't need much fresh water at a time

D．doesn't need sunshine every day

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

A．Boiling or heating the sea water.

B．The way in sunny places.

C．The Symi's way.

D．Freezing the sea water in cold places.

4．The writer is mainly talking about ________. (　)

A．water-making factories in different countries

B．the ways of making fresh water from sea water

C．hot places and dry places

D．how to make good use of the sunlight

5．Which of the following isn't 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.

 

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