北師大版高中英語必修五unit13peopleword導(dǎo)學(xué)案7-閱讀頁
2024-12-23 00:05本頁面
【正文】 or a certain length of time. The longer the heated metal takes to cool slowly, the softer it bees. Annealing can also be used on other material, such as glass. 1. 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. 2. In annealing, the required hardness of metal depends on __. ( ) A. the quantity of water used B. the temperature of the metal C. the softness of the metal D. the timing of the operation 3. As suggested by the text, how can glass be made less brittle? ( ) A. It can be heated and then cooled quickly. B. It can be cooled and then heated slowly. C. It can be heated and then cooled slowly. D. It can be cooled and then heated quickly. 答案為 A，此題屬推斷歸納題。 hard 是工藝的主觀目的。 B 項明顯錯誤； C 項是手段不是目的，因此，都可排除。 timing 是時間的選擇。由此我們可得出結(jié)論：在退火過程中，金屬的硬度是受到冷卻的時間長短影響的。文中提到 metal。文中我們已知 annealing就是先 heat后 cool slow
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