单项选择题

A catalytic agent (such as) platinum(铂) may be used (so) the chemical reaction (advances) more (rapidly).（）

A.such as
B.so
C.advances
D.rapidly

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(Not one) in one hundred children exposed to the disease (are) (likely) (to develop) symptoms of it.（）

A．Not one
B．are
C．likely
D．to develop
单项选择题
Under no circumstances ______ other countries.
A．we should invade
B．should we invade
C．we invade
D．should we not invade
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