单项选择题

There was a rapid increase in population in the last century.

A. slow
B. high
C. shocking
D. quick
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单项选择题
Human beings cannot exist without air.
A. live
B. breathe
C. exercise
D. grow
单项选择题
Even though his parents wanted him to become a doctor, Peter, chose his vocation as a writer.
A. vacation
B. profession
C. work
D. variety
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