问答题

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该句包含it is tim......

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单项选择题
The pesticide DDT can be effective against ______.
A．malaria
B．animals
C．wildlife
D．human nervous system
单项选择题
Which of the following demographic growth patterns is most suitable for the long thin powder fuse analogy
A．A virtually stable or slightly decreasing period and then a sudden explosion of population.
B．A slow growth for a long time and then a period of rapid, dramatic increase.
C．Too many people on earth and a few rapid increase in the number added each year.
D．A long period when death rates exceed birthrates and then a short period with higher fertility and lower mortality.
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