★今日学习★
做题时，我们怎么根据常识来推断答案呢？一起来看看吧.
★小方法★
有些时候，文章里并没有提供任何可据以推断的材料，或虽有提供，但却不足以推出正确的未知事实. 这时便须根据平常积累的有关知识来进行推断.
★小小练习★
Annealing is a way of making metal softer by heating it and then letting it cool very slowly
If metal is heated and then cooled very quickly, for example by dipping it in water, it will be very hard but also very brittle--that is, it will break easily. Metal that has been annealed is soft but does not break as easily. It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly for a certain length of time. The longer the heated metal takes to cool slowly, the softer it becomes. Annealing can also be used on other mates, such as glass.
Why do people put hot metal in water?______
A. To make it hard. B. To make it soft. C. To make it cool. D. To make it brittle
答案：A
解析：从文中“by dipping it in water，it will be very hard but also very brittle.”这一信息还不足以推出正确答案。然后根据物理常识，在制造各种工具时，往往采取淬火这一工艺，其目的是使金属变硬以便制成锋利的工具。即可推出选项A为正确答案。
译文反白可见：
译文：淬火就是使金属温和加热后,然后让它冷却非常缓慢。
如果金属加热,然后迅速冷却,例如蘸水,它会很难,但也很脆 ——也就是说,它将打破容易。金属被退火是软但不失一样容易。它可以使金属作为硬或柔软如是希望,通过退火它。金属加热,并允许慢慢冷却一段时间的。越热的金属才能慢慢冷却,它变得柔软。退火也可以用于其他物质,如玻璃。
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