B. The ways of making fresh water from sea water
C. Hot places and dry places
D. How to make good use of the sun
3. The Symi factory_______.
A. seems good but too small
B. is a fresh water-making factory
C. can make much fresh water at a time
D. does not need sunshine every day
4. 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 hotter and drier places
C. The Symis way
D. Freezing the sea water in cold 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 more fresh water with the least money.
D. The Symis way does not work in dry places.
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