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.
Answer:
毫无头绪，请大家指教，最N的是我觉得这题好像没结论，请高手指教
不是高手…..只是新手来挑战..
这道D??
我觉得D只是文章全部改写的浓缩版
D选: 相较于本来有built-in clock, 没有built-in clock微波炉的家庭，也不可能会再放一个要另外要接电的clock。
因为第一句说许多家电用品用电是当他们使用时。
而D就是假设前提啰！
因为本来就没built-in clock了！表示当初就认为没有使用的必要，于是也不会想再用外接的clock，而刚好符合题目的first sentence 其它后面，都只是要影响思考的废话。
A Households that do not have a microwave oven use less energy per year, on average, than do households that have a microwave oven.->非文章讨论范围
B Microwave ovens with a built-in clock do not generally cost more to buy than microwave ovens without a built-in clock.->明显与文章论述相反
C All households that have a microwave oven also have either a gas oven or a Conventional electric oven.->IR
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.->比较microwave oven with a built-in clock与without a built-in clock拥有人数多寡NONSENSE
请指教
我走错房间了，这题题号仿佛是24-18呀。
既然进来了顺便说一句，这题打字水平实在够呛啊！结论貌似是
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.
lily的选项跟我一样，但解释跟我有点不一样，我觉得D的意思是
微波炉里没有钟的家庭不会比有钟的家庭多买一个钟。
也就是说如果一般微波炉里没有钟的家庭如果还要另外多用一个钟，那么其家庭费电量与微波炉有钟的家庭不会还是一年差45度了（至少差距缩小）
另外个人觉得相对比较有迷惑性的选项是B：说内置钟的微波炉购买的成本不比无钟的微波炉高。这个结论貌似拉大了两种家庭的成本差，但是看结论的问法仅仅是问耗电量比较，没有提其他经济成本，所以这个选项超出结论讨论范围了。
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