单项选择题

Sheila was going to say something about the matter; but ______ she gave it up.

A．on the second thoughts
B．on the second thought
C．on second thoughts
D．on second thought
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单项选择题
Chemists, physicists and mathematicians are ______ known as scientists.
A．alternatively
B．cognitively
C．exclusively
D．collectively
单项选择题
A whale is ______ a fish ______ a camel is.
A．no more.., than
B．not so much.., as
C．no... more than
D．not so... much as
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