单项选择题

The speaker think the causes of automobile accidents are________.

A．obvious.
B．very complicated
C．familiar
D．not well understood
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单项选择题
Women prisoners in Britain________.
A．are kept in open prisons
B．are allowed out of the prison grounds
C．are ordered to do cooking and cleaning
D．are a small portion of the prison population
单项选择题
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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