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
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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
单项选择题
With what aspect of bears' lives is the passage mainly concerned
A．Their evolution.
B．Their hunting skills.
C．Their temperament.
D．Their seasonal movements.
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