单项选择题

Before DNA fingerprinting is used, suspects ________.

A．would have to leave their fingerprints for further investigations
B．would have to submit evidence for their innocence
C．could easily escape conviction of guilt
D．could be convicted of guilt as well

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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 arguable 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

According to the passage, why can't most of the American poor people find a good job

A．Because they are too lazy to work.
B．Because they lack professional skills.
C．Because most of the American poor people are the young children and the old people.
D．Because they have many mental problems.

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