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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单项选择题
In the bush, the ill (took it to be) only logical (if) the one who could dure an illness (should also possess) the ability of causing it, and (that) even at a distance.
A．took it to be
B．if
C．should also possess
D．that
单项选择题
(As gentle as possible), and (with help from) an assistant, the veterinarian examined the hippo to determine (if) (she) was pregnant.
A．As gentle as possible
B．with help from
C．if
D．she
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