多项选择题

If you had________ (听从了我的忠告，你就不会陷入麻烦).
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单项选择题
Two Australian billionaires have been placed on the waiting list for entering space as private passengers.
A．Y
B．N
C．NG
单项选择题
A scientist being interested in adding to our general knowledge about oxygen would probably call his approach ______.
A．applied science
B．environmental science
C．pure science
D．agricultural science
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