单项选择题

The main idea of the passage is ______.

A．the development of sonar technology
B．how to avoid ship and whale collision
C．the hot spots for whale collision
D．the giant creature of the sea
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单项选择题
WACS can reduce the whale collisions by ______.
A．warning whales to get away from passing ships
B．attacking ambient noise imaging tags onto the whales
C．directing passing ships to turn away from the whales
D．teaching the whales to send signals to the passing ships
单项选择题
The sentence the toppled emperor is made painfully aware of the naked vanity of his own legend can best be paraphrased as ______.
A．the fallen emperor is forced to acknowledge his own incapability
B．the defeated emperor has painfully got to know the useless pursuit of the naked vanity of his own fate
C．the badly beaten emperor has painfully got to realize the true value of vanity of his own leg- end
D．the overthrown Napoleon Bonaparte has got to realize how ridiculous his pursuit of the naked honor and popularity was
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