单项选择题

Who would be very much interested in the passage

A．Missile builders.
B．Fishermen.
C．Military scientists.
D．Ship builder.
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单项选择题
Which of the following does the passage mainly discuss
A．Missiles carried by submerged submarines.
B．Messages sent by submerged submarines.
C．Blue-green lasers used by submerged submarines.
D．The way to send a message to submerged submarines.
单项选择题
Which of the following is TRUE according to the passage
A．Water is a barrier to radio communication.
B．Lasers have found wide application in submarine communication.
C．Water absorbs all kinds of electromagnetic waves.
D．Very low frequency radio waves cannot be used to contact submarines.
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