单项选择题

A．One year.
B．Five years.
C．Seven years.
D．Ten years.
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单项选择题
Slightly less than a third of CO2 emissions in the United States are caused by deforestation.
A．Y
B．N
C．NG
单项选择题
The passage is chiefly about ________.
A．an effort to protect an endangered marine species
B．the civilian use of a military detection system
C．the exposure of a U. S, Navy top-secret weapon
D．a new way to look into the behavior of blue whales
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