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My View on Brain Drain
Nowadays brain drain has ......
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单项选择题
The timbre of a musical sound is dependent on its ______.
A.fundamental
B.amplitude
C.frequency
D.overtones
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单项选择题
Where male beetles are smaller than female beetles, it is because ______.
A.they have to fight for their mates
B.they are more intelligent
C.they are ephemeral creatures
D.there is ample time for mating
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