单项选择题

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

A．At the library.
B．At the airport.
C．At the post office.
D．At the teacher’s office.
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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
问答题
The situation will worsen ___________________________ (除非采取措施加以阻止).
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