Annealing can make metal A. hard and tough(韧) B. hard but brittle C. soft but tou——青夏教育精英家教网—

摘要： Annealing can make metal A. hard and tough(韧) B. hard but brittle C. soft but tough D. soft and brittle New Zealand is an English-speaking country. But the government recognizes another language, too. This is the Maori language. English sailors began to visit New Zealand after 1770. They found the Maoris, a dark-skinned people, living there. They had come from the islands in the Pacific Ocean 400 years before the 14th century. For a long time the British Government was not very interested in these far-away islands. It was made a British colony in 1840. In this year the first British people came to settle in the new country. More and more settlers came from Britain later. The Maoris were friendly to the first settlers. But soon the new settlers wanted the Maoris’ land. So in 1844 there was a fighting between them. This was the first of several wars between the two peoples. The next fifty years was very bad for the Maoris. Many were killed in the wars. Many more died from new diseases brought by the British. In 1840 there were perhaps 200,000 Maoris. By 1896 this number had fallen to 42,000 For many years, the British new Zealanders looked down upon the Maoris. In this country the two peoples have lived in peace. They have equal rights and the Maori language is one of the languages of the country. Today there are about a quarter of a million Maris, that is, about 9% of the population. Most of them live in North Island. They have a rich culture and a great love of singing and dancing.

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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 (韧) 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

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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 (浸) 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 (韧). 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.

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A．hard and tough (韧).	B．hard but brittle.
C．soft but tough.	D．soft and brittle.

【小题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.

【小题3】As suggested by the text, how ca

n 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.

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阅读下面短文，从短文后各题所给的四个选项(A、B、C、D)中，选出可以填入空白处的最佳选项。

Annealing(韧化)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(浸)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(韧)．
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．

(4)

The passage mainly ________．
[　　]
A．	talks about metal
B．	tells us a story
C．	talks about a scientific method
D．	talks about heating

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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(浸)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 material, such as glass．

(1)

Annealing can make metal ________．
[　　]
A．	hard and tough(韧)
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)

In annealing, the required hardness of a metal depend 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

(4)

As suggested by the text, how can glass be made less brittle?
[　　]
A．	It can be heated an 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．

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