单项选择题

It is well known that teaching is a job _____ enough patience.

A．calling on
B．calling off
C．calling for
D．calling in
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单项选择题
Surely it doesn’t matter where the clubs get their money； what_____ is what they do with it.
A．counts
B．applies
C．stresses
D．functions
单项选择题
The chemical substance missing from polished rice______.
A．was vitamin B
B．did not affect the chickens
C．was named the Eijkman vitamin
D．has never been accurately identified
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