单项选择题

（） the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.

A．Even if
B．As far as
C．If only
D．So long as

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单项选择题
（） in an atmosphere of simple living was what her parents wished for.

A．The girl was educated
B．The girl educated
C．The girl's being educated
D．The girl to be educated
单项选择题
In a time of social reform, people's state of mind tends to keep （） with the rapid changes of society.

A．step
B．progress
C．pace
D．touch
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