单项选择题

All living things must, ________ reason of physiological limitations, die.

A．on
B．to
C．by
D．for
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单项选择题
A sneeze cannot be performed voluntarily, ________ be easily suppressed.
A．nor it can
B．it can not
C．nor can it
D．cannot it
单项选择题
You should ________ your room now and then to keep it supplied with fresh air.
A．ventilate
B．versatile
C．verify
D．versify
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