单项选择题

The desegregation was achieved through a number of struggles, ________ been mentioned in previous chapters.

A．a few of which
B．a few of them
C．a few of those
D．a few of that
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单项选择题
How much money do you need？ Well, $ 200 will see me ________ .

A．through
B．out
C．off
D．away
单项选择题
How long did the Pony Express Exist
A．61 years.
B．6 months.
C．One year.
D．18 months.
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