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GWD-24-Q 18: Most household appliances use electricity only when in use. Many microwave ovens, However, have built-in clocks and so use some electricity even when they are not in Use. The clocks each consume about 45 kilowatt-hours per year. Therefore, house Holds whose microwave oven has no built-in clock use 45 kilowatt-hours per year Less. On average, than do comparable households shoes microwave oven is other- Wise similar but has a built-in clock.
Which of the following is an assumption on which the argument depends? A. Households that do not have a microwave oven use less energy per year, on average, than do households that have a microwave oven. B. Microwave ovens with a built-in clock do not generally cost more to buy than microwave ovens without a built-in clock. C. All households that have a microwave oven also have either a gas oven or a Conventional electric oven. D. Households whose microwave oven does not have a built-in clock are no more likely to have a separate electric clock plugged in than households whose microwave oven has one. E. There are more households that have a microwave oven with a built-in clock than there are households that have a microwave oven without a built-in clock.
答案是D，题目最后一句结论不是很懂，请教！ | 
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发表于 2007-7-2 20:42:00
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