单项选择题

An appropriate title for this selection would be ________.

A．A Peacetime Use of the Atom
B．Atoms and Molecules
C．The Satellite Timekeepers
D．The Role of the Clock
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单项选择题
The damaging effect of the treatment many American children receive today ________.
A．has not been taken seriously
B．has aroused hot debates
C．is beginning to be recognized
D．is unquestionable
单项选择题
It can be inferred from the passage that the polar bear population of Hudson Bay ________.
A．is one of several polar bear populations
B．is unfriendly toward humans
C．consumes food voraciously (贪婪地) during the whole year
D．is an endangered species
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