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单项选择题
According to the passage, why does the cancer increase
A.Because people expose too much to the computer.
B.Because people don’t care about the low levels of radiation.
C.Because the cells are killed by radiation.
D.Because the cells produce themselves in an unusual way.
单项选择题
Why should children be educated about the harm of smoking at an early age
A.Because small children are more curious about cigarettes.
B.Because smoking is difficult to give up for children.
C.Because the early age is the time to form values.
D.Because children’s health is more venerable to the hurt of cigarette.
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