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單項選擇題

The population of the world is growing at a dangerous（）

A.measure
B.rate
C.increase
D.progress

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All kinds of vegetables（）in the free market.

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

單項選擇題

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

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