单项选择题

Allen is buying the tickets ______

A．because she gets a student discount
B．because Bob does n' t have very much money
C．because she lost a bet and owes Bob money
D．because Bob left his wallet at home
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单项选择题
It can be inferred from the passage that ______
A．new radio devices should be developed for tracking the endangered blue whales
B．blue whales are no longer endangered with the use of the new listening system
C．opinions differ as to whether civilian scientists should be allowed to use military technology
D．military technology has great potential in d 'civilian use
单项选择题
Which of the following is true about the U.S. Navy underwater listening network.
A．It is now partly accessible to civilian scientists.
B．It has been replaced by a more advanced system.
C．It became useless to the military after the cold war.
D．It is indispensable in protecting endangered species.
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