單項(xiàng)選擇題

There have been many（）in their marriage but they still love each other.

A.ups and downs
B.from head to toe
C.time and again
D.over and over

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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

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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