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单项选择题
A．One sixth of them are seriously polluted.B．One third of them are seriously polluted.C．Half of them are seriously polluted.D．Most of them are seriously polluted.
A．One sixth of them are seriously polluted.
B．One third of them are seriously polluted.
C．Half of them are seriously polluted.
D．Most of them are seriously polluted.
单项选择题
A．They took objective tests.B．They specialized in one subject.C．They were timed by electric clocks.D．They never wrote exams.
A．They took objective tests.
B．They specialized in one subject.
C．They were timed by electric clocks.
D．They never wrote exams.
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