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In 1960, 10 percent of every dollar paid in automobile insurance premiums went to pay costs arising from injuries incurred in car accidents. In 1990, 50 percent of every dollar paid in automobile insurance premiums went toward such costs, despite the fact that cars were much safer in 1990 than in 1960.

Which of the following, if true, best explains the discrepancy outlined above?

(A) There were fewer accidents in 1990 than in 1960.

(B) On average, people drove more slowly in 1990 than in 1960.

(C) Cars grew increasingly more expensive to repair over the period in question.

(D) The price of insurance increased more rapidly than the rate of inflation between 1960 and 1990.（E）

(E) Health-care costs rose sharply between 1960 and 1990

E, CD怎么错?

Roland: The alarming fact is that 90 percent of the people in this country now report that they know someone who is unemployed.

Sharon: But a normal, moderate level of unemployment is 5 percent, with 1 out of 20 workers unemployed. So at any given time if a person knows approximately 50 workers, 1 or more will very likely be unemployed.

15.   Sharon’s argument is structured to lead to which of the following as a conclusion?

(A) The fact that 90% of the people know someone who is unemployed is not an indication that unemployment is abnormally high.

(E) If an unemployment figure is given as a certain percent, the actual percentage of those without jobs is even higher.

答案是A,怎么理解呢?