单项选择题

A．To play basketball with friends from work.
B．To try out for the company baseball team.
C．To get in shape and compete in a cycling race.
D．To join in a basketball club.
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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
It can be inferred from the passage that ______.
A．new radio devices should be developed for tracking the endangered blue whales
B．blue whales are no longer endangered with the use of the new listening system
C．opinions differ as to whether civilian scientists should be allowed to use military technology
D．military technology has great potential in civilian use
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