单项选择题

A．They set their own exams.
B．They select their own students.
C．They award their own degrees.
D．They organize their own laboratory work.
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单项选择题
A．On short trips.B．On long trips.C．When flying over cities.D．When flying at high altitude.
A．On short trips.
B．On long trips.
C．When flying over cities.
D．When flying at high altitude.
单项选择题
According to Hartung, the toxicity tests used for tens of years are simply bad science.
A．Y
B．N
C．NG
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