单项选择题

案例分析题 For Web addresses, Chinese speakers now have to use （）.

A．pinyin
B．signs
C．numbers
D．characters

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单项选择题
His marked personality changes were ______ by a series of unfortunate events.
A．carried on
B．counted on
C．brought about
D．made up
单项选择题
It would be ______ a risk to let the child go to school by himself.
A．following
B．passing
C．running
D．carrying
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