单项选择题

In the first paragraph, it can be concluded that ______.

A.people have no need to worry cell phones can cause cancer
B.it is not dangerous for long-term cell-phone users
C.cell-phone users reassure them about using cell-phones
D.they found a slightly increased risk for a rare type of brain cancer
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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
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
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