单项选择题

A．June 30 to July 1.
B．May 1 to May 30.
C．June 1 to June 30.
D．May 31 to June 4.
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单项选择题
A．5-minutes.B．10 minutes.C．45 minutes.D．50 minutes
A．5-minutes.
B．10 minutes.
C．45 minutes.
D．50 minutes
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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