单项选择题

According to the news item the volcano had been dormant for about ______.

A．45 years
B．60 years
C．30 years
D．200 years
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单项选择题
As one of the world's most active volcanic zones, Kamchatka is close to ______.
A．the Arctic Ocean
B．the Pacific Ocean
C．the Atlantic Ocean
D．the Black Sea
单项选择题
The current rate of annual increase in the world population is about ______.
A．5.7 million
B．9 million
C．20 million
D．90 million
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