填空题

Southern Africa has ______(该病的患病率最高，几乎是亚洲的两倍).

【参考答案】

the highest rates of this disease，almost twice that of Asia

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填空题

burglar→burglary

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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