单项选择题

A．Welding car.
B．Computer.
C．Machine.
D．Science fiction.
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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
单项选择题
In 1997, some provinces had established the AIDS prevention and control coordination meeting system respectively.
A．Y
B．N
C．NG
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