单项选择题

It is (largely) through perspiration, (or) the evaporation of water (through) the pores, that humans(rid them) of excess moisture.

A．largely
B．or
C．through
D．rid them
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Unless (they are so permitted) by the attending (physician), no visitors or relatives (can) enter, the (patient's) room
A．they are so permitted
B．physician
C．can
D．patient's
单项选择题
Ores which (are occurred) naturally (as) elements, such as gold (are of) extreme rarity and (are occasionally) of high value.
A．are occurred
B．as
C．are of
D．are occasionally
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