单项选择题

A．They will gradually die out.
B．They will be able to survive in the preserves.
C．They will have to migrate to find new homes.
D．They will face extinction without artificial reproduction.
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单项选择题
A．Many welcome the idea of having more bars on board.B．Many prefer the ferry to maintain its present speed.C．Some suggest improving the design of the deck.D．Some object to using larger luxury boats.
A．Many welcome the idea of having more bars on board.
B．Many prefer the ferry to maintain its present speed.
C．Some suggest improving the design of the deck.
D．Some object to using larger luxury boats.
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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