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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热门试题

单项选择题

Which of the following is true about the U. S. Navy underwater listening network

A．It is now partly accessible to civilian scientists.
B．It has been replaced by a more advanced system.
C．It became useless to the military after the cold war.
D．It is indispensable in protecting endangered species.

单项选择题

Why did Joy leave her children in the car

A．She didn't like shopping with children.
B．She didn't like waking up her baby.
C．Stephen was big enough to take care of his sister.
D．It was icy cold outside.