单项选择题

______is not only the health of humans but that of the earth.

A．At cost
B．At stake
C．At length
D．At intervals
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单项选择题
To alleviate the problem of contaminated chicken, the experts recommend that the government shift its inspection emphasis from cursory bird-by-bird visual check to a more ______random sampling for bacterial and chemical contamination.
A．rigorous
B．perfunctory
C．symbolic
D．discreet
单项选择题
There are also medical treatments, such as chemotherapy, which can cause a person to ______go bald.
A．infinitely
B．temporarily
C．comfortably
D．favorably
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