单项选择题

Because American parents believe that knowledge leads to a meaningful life, they try to give youngsters many opportunities to develop skills and______ interests.

A．worth
B．worthy
C．valuable
D．worthwhile
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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
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
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