单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．Husband and wife.
B．Teacher and student.
C．Policeman and driver.
D．Mother and son.
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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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