单项选择题

All kinds of vegetables（）in the free market.

A.can buy
B.will buy
C.is bought
D.can be bought

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单项选择题
The weather in Kunming is better than（）in Beijing.

A.one
B.this
C.those
D.that
单项选择题
Certain measures should be taken to control environmental（）

A.pollution
B.pollutant
C.pollute
D.polluting
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