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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1.單項(xiàng)選擇題The wise man exercises（）in his behavior and enjoyments.
A.limitation
B.interest
C.restriction
D.restraint
2.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
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