单项选择题

The author's view in this passage is that ______.

A．cell phones and cancer are not linked
B．people shouldn't use cell-phones in a long-term
C．using cell-phones is one cause for cancer
D．cell-phones are not harmful
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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
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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