单项选择题

It is not feasible to build sea defenses to protect against erosion because ______

A．house agents along the coast do not support the idea
B．it is too costly and will endanger neighboring areas
C．the government is too slow in taking action
D．they will be easily knocked down by waves and currents
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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B．It has been replaced by a more advanced system.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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