单项选择题

What does the passage mainly concern

A．It concerns distance and bodily contact.
B．It concerns body language.
C．It concerns cultural differences between the East and the West.
D．It concerns hand signals.

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单项选择题

The underwater listening system was originally designed ______.

A．to trace and locate enemy vessels
B．to monitor deep-sea volcanic eruptions
C．to study the movement of ocean currents
D．to replace the global radio communications network

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