单项选择题

At first, the speaker was referring to the problem of pollution in the country but halfway in her speech, she suddenly ______ to another subject.

A．committed
B．favored
C．switched
D．transmitted
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单项选择题
He was so mean that he couldn't bear to ______ the smallest sum of money for the charity appeal.
A．pay off
B．give in
C．part with
D．let out
单项选择题
The word ______ from a Greek noun with a quite different meaning.
A．obtains
B．gains
C．receives
D．derives
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