单项选择题

To succeed in a scientific research project, ______.

A．one needs to be persistent
B．persistence is needed
C．one needs be a persistent person
D．persistence is what one needs
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单项选择题
Scarcely ______ now without some sort of incident involving the old lady living at the end of the lane.
A．a day passes
B．passes a day
C．does a day pass
D．has a day Passed
单项选择题
This playground is ______ the playground we had in our high school.
A．ten times larger
B．ten times that of
C．ten times as large as
D．as large as ten times
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