单选题：__________ vigilance is necessary in order to avoid accident

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题目内容：
__________ vigilance is necessary in order to avoid accidents. A． Constant
B． Continual
C． Continuous
D． Incessant
参考答案：
答案解析：

In other words, all the citizens, __________ their backgroun

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Since all of them have left, you __________ not have stayed.

Since all of them have left, you __________ not have stayed.A． must B． need C． c

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错误2：__________

错误2：__________

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下列对世界人口有关问题的预测不准确的是（　　）。A．人口老龄化趋势将继续发展，一些国家将成为超高龄国家 B．白种人在世界总人口中所占的比重逐渐减少 C．50年后

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