Question

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(脆)---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 materials, such as glass.

1. Annealing can make metal _______________.

A．hard and tough (韌)                      B．hard but brittle

C．soft but tough                          D．soft and brittle

2. 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

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

 

Answer 1

【答案】

1.C

2.A

3.C  

【解析】

試題分析：文章介紹了一種冶金的方法：annealing（退火）是將工件加熱到適當(dāng)溫度，然后進(jìn)行緩慢冷卻，目的是使金屬組織更細(xì)，更堅(jiān)硬。

1.細(xì)節(jié)題：從文章的句子Annealing is a way of making metal softer by heating it and then letting it cool very slowly. 和It is possible to make metal as hard or as soft as is wished, by annealing it.可知金屬通過annealing可以變得柔軟和堅(jiān)韌。選C

2.細(xì)節(jié)題：從文章的句子：by dipping it in water , it will be very hard but also very brittle(脆)可知把熱的金屬放進(jìn)水里可以使金屬變硬。選A

3.推理題：從文章的句子：The longer the heated metal takes to cool slowly , the softer it becomes .可知玻璃也是加熱后慢慢冷卻可以變得堅(jiān)韌。選C  

考點(diǎn)：考查科普類短文

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