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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 !

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

Ais needed in many countries

Bis needed in every country

Ccan be used in many ways

Dis very important for factories

2The Symi factory ________. ( )

Ais a fresh-water factory

Bcan be built everywhere

Cdoesn't need much fresh water at a time

Ddoesn't need sunshine every day

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

ABoiling or heating the sea water.

BThe way in sunny places.

CThe Symi's way.

DFreezing the sea water in cold places.

4The writer is mainly talking about ________. ( )

Awater-making factories in different countries

Bthe ways of making fresh water from sea water

Chot places and dry places

Dhow to make good use of the sunlight

5Which of the following isn't true? ( )

ANew ways are tried to get fresh water.

BA lot of fresh water can be made quickly by heating.

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

DThe Symi's way doesn't work in dry places.

 

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