单项选择题

A．Peaches are in season now.
B．Peaches are not at their best now.
C．The woman didn’’t know how to bargain.
D．The woman helped the man choose the fruit.
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单项选择题
A．He sold fast food.B．He raised dogs.C．He was a cook.D．He was a cartoonist.
A．He sold fast food.
B．He raised dogs.
C．He was a cook.
D．He was a cartoonist.
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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