单项选择题

  We shall probably never be able to ______ the exact nature of these sub-atomic particles.

A.assert
B.impart
C.ascertain
D.notify
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单项选择题
The law on drinking and driving is ______ stated.
A.extravagantly
B.empirically
C.exceptionally
D.explicitly
单项选择题
His ______ directions confused us; we did not know which of the two roads to take.
A.ambiguous
B.complicated
C.arbitrary
D.intricate
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