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

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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

单项选择题

Which of the following statements is NOT true

A．GPRS offers faster access to data through network connections, so customers should pay more.
B．Motorola Inc. is the inventor of the cell phone.
C．Previously Motorola only supplied mobile phone manufacturers with some of its chips.
D．Motorola Inc. is known for its high-class engineering culture.