单项选择题


A．classification
B．definition
C．function
D．perception
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单项选择题
A．boundlessB．changeableC．limitlessD．ceaseless
A．boundless
B．changeable
C．limitless
D．ceaseless
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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