单项选择题

The author emphasizes that many of the facts you acquire by hard study （）

A．deal with rules of health
B．will be forgotten
C．are of no value
D．will be very useful

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单项选择题
From paragraph 1, we know that some 40 genes involving in cancer are（）

A．harmful to the human body
B．necessary to the human body
C．the elements that form cancer
D．useless to the human body
单项选择题
Where are most likely to be affected by caner-inducing agents according to the passage （）

A．The lung.
B．The colon.
C．The chromosomes.
D．The breast.
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