单项选择题

Internet, a _______ of millions of computers linked worldwide, is the largest system serving email messengers.

A. unity
B. connection
C. network
D. combination

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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

单项选择题

I don't know you want to keep the letter. I've ______ it up.

A. torn
B. given
C. broken
D. disposed

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