单项选择题

According to the passage, when are children first expected to study hard

A．Before 6 years of age.
B．Between 6 and 10.
C．After 10 years of age.
D．After 12 years of age.
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The main purpose of the research is________.
A．to make preparations for a new publication
B．to learn how couples spend their weekends
C．to know how housework is shared
D．to investigate what people do at the weekend
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The woman found out about the university station________.
A．from a friend
B．from the town newspaper
C．from the bulletin board
D．from the school newspaper
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