1.
选择合适的句子,补全对话。
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A. How do we
use water?
B. What should
we do?
C. Where does
water come from?
D. When do we
need water?
E. Does water
come from the rain, too?
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John: Water is
very important.
Mary: It comes
from the sea.
John:
Mary: Yes, you
are right.
John:
Mary: We use
water to wash clothes.
John:
Mary: When we are
thirsty.
John: Water is so
useful.
Mary: We should
keep the water clean.