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
The question was discarded, because it was ambiguous.
A．incorrect
B．biased
C．vague
D．dull
单项选择题
Flu shots are given every fall as a precaution against an epidemic the following winter.
A．required treatment
B．free service
C．preventive measures
D．new therapy
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