单项选择题

Since the ______ of human history, human beings have been asking questions like "What is the essence of life"

A．dusk
B．dust
C．twinkle
D．dawn
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单项选择题
My mother is a light sleeper, ______ to any sound even as low as the humming of a mosquito
A．alert
B．acute
C．keen
D．immune
单项选择题
The eldest son ______ all the family members to discuss how to celebrate the 50th wedding anniversary of their parents.
A．clustered
B．resembled
C．assembled
D．rendered
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