单项选择题

Children are becoming more inactive in study because ________.

A．they watch TV too much
B．they have done too much homework
C．they have to fulfill too many duties
D．teachers are too strict with them
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单项选择题
To such children as described in the passage ________.
A．it is easier to say no than to say yes
B．neither is easy to say yes or say no
C．it is easier to say yes than no
D．neither is difficult---to say yes or say no
单项选择题
On what are their research findings based
A．A survey of farmers in northern Japan
B．Tests performed on a thousand old people
C．The study of brain volumes of different people
D．The latest development of computer technology
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