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單項(xiàng)選擇題

The survival of civilization, as we know, is（）threat.

A.with in
B.under
C.to wards
D.upon

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單項(xiàng)選擇題

The wise man exercises（）in his behavior and enjoyments.

A.limitation
B.interest
C.restriction
D.restraint

單項(xiàng)選擇題

The police will give you a ticket if you（）the speed limit.

A.break
B.reject
C.suspend
D.exceed