单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．Twenty years.
B．Five years.
C．A couple of weeks.
D．A couple of years.
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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.
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.
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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