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
单项选择题
According to 1970 figures in the U.S. men smokers are ______.
A．twice as many as women smokers
B．two times as many as women smokers
C．1.5 times as many as women smokers
D．seventeen percent less than women smokers
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