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單項選擇題

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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The weather in Kunming is better than（）in Beijing.

A.one
B.this
C.those
D.that

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Certain measures should be taken to control environmental（）

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