填空题

It is time the authorities concerned ______(采取适当措施来解决交通问题).

【参考答案】

took proper steps to solve the traffic problems
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it→there
单项选择题
During the first period of demographic history, societies Were often in danger of extinction because ______.
A．only one in ten persons could live past 40
B．there was higher mortality than fertility in most places
C．it was too dangerous to have babies due to the poor conditions
D．our ancestors had little enthusiasm for more children
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