单项选择题

According to the passage, any vacation from thinking should be taken ______ .

A．several times throughout the year
B．during the winter
C．during the summer
D．as seldom as possible
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单项选择题
Ellsworth decided that climate and temperature have ______ .
A．a great effect on everybody's intelligence
B．some effect on a few persons' intelligence
C．some effect on most persons' intelligence
D．no effect on most persons' intelligence
单项选择题
The two best seasons for thinking seem to be ______ .
A．winter and spring
B．summer and spring
C．fall and summer
D．spring and fall
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