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單項選擇題

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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單項選擇題

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

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

單項選擇題

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