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发布时间：2006-06-23 11:56     点击：

(C) The question about the existence of intelligent life elsewhere in the universe must be made more precise if we hope to answer it correctly.

(D) The question whether there is intelligent life elsewhere in the universe is so imprecise as to be meaningless.

(E) The question whether there is intelligent life elsewhere in the universe is one we should not spend our time trying to answer.

18. The passage, if seen as an objection to an antecedent claim. Challenges that claim by:

(A) showing the claim to be irrelevant to the issue at hand

(B) citing examples that fail to fit proposed definition of "intelligent life"

(C) claiming that "intelligent life" cannot be adequately defined.

(D) arguing that the claim, if acted on, would be counterproductive

(E) maintaining that the claim is not supported by the available evidence.

19. The efficiency of microwave ovens in destroying the harmful bacteria frequently found in common foods is diminished by the presence of salt in the food being cooked. When heated in a microwave oven, the interior of unsalted food reaches temperatures high enough to kill bacteria that cause food poisoning, but the interior of salted food does not. Scientists theorize that salt effectively blocks the microwaves from that salt effectively blocks the microwaves from heating the interior.

Which one of the following conclusions is most supported by the information above?

(A) The kinds of bacteria that cause food poisoning are more likely to be found on the exterior of food than in the interior of food.

(B) The incidence of serious food poisoning would be significantly reduced if microwave ovens were not used by consumers to cook or reheat food.

(C) The addition of salt to food that has been cooked or reheated in a microwave oven can increase the danger of food poisoning.

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