单项选择题

A．He sold fast food.
B．He raised dogs.
C．He was a cook.
D．He was a cartoonist.
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单项选择题
Laying claim to DNA stretches can be careless genetics because ______.
A．those who patent gene fragments are not qualified geneticists
B．the same gene fragments are often patented by different scientists
C．geneticists have no idea what they are going to do with patented genes
D．some of the gene fragments patented contain no real genetic information
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