单项选择题

The doctors successfully completed a 20-hour operation to _______ the one-year-old twins at the head.

A．isolate
B．separate
C．divide
D．remove
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单项选择题
It was Thomas Edison that ________ the electric lamp.
A．invented
B．discovered
C．designed
D．developed
单项选择题
Parents have _________ their concern about violence in some children’s shows.
A．expressed
B．accepted
C．complained
D．expected
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