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.
1.答案为A。此题属推断归纳题。文中第二句说如果把金属加热,然后迅速放到水里冷却,它就会变得非常硬,但也变得很脆。hard 是工艺的主观目的。 brittle 是伴随的客观结果,故选A而不选D。B项明显错误;C项是手段不是目的,因此,均可排除。
2.答案为D。此题属概括归纳题。timing是时间的选择。本答案的依据是第5和第6两句,The metal is heated? ... length of time., The longer... the softer it becomes. cool的时间是可以控制的,时间越长越 soft,即硬度就越低。由此我们可得出结论:在退火过程中,金属的硬度是受冷却时间的长短影响的。
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