单项选择题

Now there are sophisticated tests which can______ poisons in the tiniest amount not even enough to kill a mouse.

A．discern
B．ascertain
C．detect
D．locate
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单项选择题
Chinese diplomatic envoys were sent who should strengthen our international position and strive for world peace and friendly______ among peoples.
A．collaboration
B．harmony
C．coordination
D．intercourse
单项选择题
Whether to go to college is optional ______that no student is required to do so as he is required by law in most states of America to go to high school.
A．in a sense
B．in the way
C．in the sense
D．in the case
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