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
A sheet of metal was shaken to ________ the sound of thunder.
A．stimulate
B．simulate
C．reproduce
D．duplicate
单项选择题
When he bent down to tie his shoelace, the belt of his trousers ________.
A．ruined
B．cracked
C．broke
D．split
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