单项选择题

[A] used [C] cost
[B] spent [D] needed

A．used
B．spent
C．cost
D．needed
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单项选择题
[A] starting [C] keeping[B] leaving [D] repairing
A．starting
B．leaving
C．keeping
D．repairing
单项选择题
Why did the U.S. Navy set up underwater microphones around the world in the 1960s
A．To listen for changes in ocean structure.
B．To listen for changes of ocean currents or volcanic activity.
C．To make sure whether there was a giant squid deep in the ocean.
D．To follow the track of the Soviet warships under water.
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