推 wolftin:如果取非=有外接=和build-in一樣耗電=weaken 06/03 19:01
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, households whose microwave oven has no built-in clock use 45
kilowatt-hours per year less. On average, than do comparable households whose
microwave oven is otherwise 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
其餘答案我都可以排除錯誤
但我想知道 D取非有反駁嗎???
謝謝
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