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單項(xiàng)選擇題

The United Nations Conference on Global Environment, which took place earlier this year in Vienna, was a very（） meeting.

A.productive
B.communicative
C.aggressive
D.protective

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單項(xiàng)選擇題

We watched the plane（）behind the clouds.

A.disappearing
B.disappeared
C.diving
D.dived

單項(xiàng)選擇題

Pipes made of plastic are now widely used in building as they are light and do not become （）in water.

A.ripe
B.instant
C.rotten
D.mature