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第1题

In many countries now seat belts are _____ for the driver and front seat passengers at least.　 (A) necessary
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第2题

In many countries now seat belts are _____ for the driver and front seat passengers at least.　 (A) necessary (
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第3题

The imbalance between males and females could ______ serious consequences.　 (A) change into (B) lead to (C)
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第4题

The ____of human life is short.　 (A) stage (B) strech (C) space (D) span
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