單項(xiàng)選擇題

The local government tried its best to ensure each of its citizens a（）supply of food at regular intervals (時(shí)間間隔).

A.consistent
B.continual
C.continuous
D.numerous

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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

單項(xiàng)選擇題

We watched the plane（）behind the clouds.

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