单项选择题

[A] starting [C] keeping
[B] leaving [D] repairing

A．starting
B．leaving
C．keeping
D．repairing
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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.
单项选择题
What can be concluded from the passage
A．Scientists' discoveries always change people's belief.
B．There are too many secrets to be discovered.
C．Megalodon may be still alive deep in the ocean.
D．"Deep sound channel" allows sound waves to travel undisturbed.
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