单项选择题

The subject matter was so technical as to be beyond the ______ of the average layman.

A. sphere
B, realm
C. ken
D. kingdom
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单项选择题
It is becoming increasingly clear that stress can wreak ______ not only with the immune system, cardiovascular system but hormones too.
A．havoc
B．misery
C．lement
D．wreck
单项选择题
He has realized-the mistake he had made and wanted to ______ himself.
A．deny
B．redeem
C．exempt
D．conceal
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