单项选择题

According to the census prediction, the average male Americans will be expected to live up to （） years of age by 2050.

A．73.3
B．75.1
C．81.3
D．83.6

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单项选择题
Crime experts predict that in the near future crime rates will first decrease in（）

A．South and Southwest.
B．North and Northeast.
C．Southwest and Midwest.
D．Northeast and Midwest.
单项选择题
The passage is primarily （）in the development of the thesis.

A．persuasive
B．descriptive
C．narrative
D．expository
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