单项选择题

A．To save money on food.
B．To buy food without additives.
C．To do all his shopping in one place.
D．To meet other health-conscious people.
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单项选择题
To geneticists like Lewontin and Hartl, the current method ______.
A．is not so convincing as to exclude the likelihood that two DNA samples can never come from two individuals
B．is beyond dispute because two individuals of the same ethnic group are likely to have the same DNA pattern
C．is not based on adequate scientific theory of genetics
D．is theoretically contradictory to what they have been studying
单项选择题
Users with IAD often find it difficult to get along in their work.
A．Y
B．N
C．NG
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