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
According to the passage, a murder would most likely occur ________.
A．on a weekend night in winter
B．on a weekday afternoon in summer
C．on a weekend night in summer
D．on a weekday night in winter
单项选择题
Implied but not stated: ________.
A．precise timekeeping is essential in science
B．scientists expect to disprove Einstein’s relativity theories
C．atomic clocks will be important in space flight
D．the rate of vibration of an atom never varies
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