单项选择题

Muscat's research and a study in New England Journal of Medicine demonstrate that ______.

A．cell phones don't seem to cause brain cancer
B．if you use cell-phone in a long term it is possible to cause brain cancer
C．782 brain cancer patients are caused by using cell-phones
D．the two researches of them are not scientific
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单项选择题
The last paragraph tells us that ______.
A．education in the wilderness is a matter of financial means
B．juvenile delinquency is the result of parental negligence of their children's education
C．making a living away from home is an excuse for the negligence of children
D．some families can hardly pay for the tuition for their children
单项选择题
The passage implies that many countries lay great emphasis on education because ______.
A．they want to get back monetary rewards
B．without education, people would be deprived of the greatest twentieth century opportunities
C．they want to cultivate the potential leaders
D．the well educated generation is the future of those countries
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