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

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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 civilian use

单项选择题

The result of Holmes-Rahe's medical research tells us ______.

A．the way you handle major events may cause stress
B．what should be done to avoid stress
C．what kind of event would cause stress
D．how to cope with sodden changes in life