单项选择题

In the phenomenon of atomic fission, the nucleus is split into two pieces of approximately equal mass.

A．doubly
B．always
C．solidly
D．about
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单项选择题
Jane was quite annoyed(下划线) with Jerry for arriving so late.
A．put off
B．put on
C．put down
D．put out
单项选择题
Mark Twain is one of the best American creative writers.
A．productive
B．inventive
C．fanciful
D．ingenious
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