单项选择题

Which of the following best states the main idea of the passage（）

A. Noise is a major problem; most people recognize its importance.
B. Although noise can be annoying, it is not a major problem.
C. Noise is a major problem and has not yet been recognized as such.
D. Noise is a major problem about which nothing can be done.

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单项选择题

Which of the following correctly describe the situation in Australia（）

A. The number of confirmed cases of swine flu has tripled in the past month.
B. Australia arouses the world’s attention because of the number of its infected cases.
C. Australia accorded its first case of H1N1 on May 9.
D. Many people are infected with H1N1 in its capital Melbourne.

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