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六级阅读选词填空steel

Steel is valued for its reliability, but not when it gets cold. Most forms of steel ___26__ become brittle(脆的)at temperatures below about -25℃ unless they are mixed with other metals. Now, though, a novel type of steel has been developed that resists ___27__ at much lower temperatures, while retaining its strength and toughness – without the need for expensive ___28__.

Steel’s fragility at low temperatures first became a major concern during the Second World War. After German U-boats torpedoed(用鱼雷攻击)numerous British ships, a 2700-strong fleet of cheap-and-cheerful “Liberty ships” was introduced to replace the lost vessels, providing a lifeline for the ___29__ British. But the steel shells of hundreds of the ships ___30__ in the icy north Atlantic, and 12 broke in half and sank.

Brittleness remains a problem when building steel structures in cold conditions, such as oil rigs in the Arctic. So scientists have ___31__ to find a solution by mixing it with expensive metals such as nickel.

Yuuji Kimura and colleagues in Japan tried a more physical ___32__. Rather than adding other metals, they developed a complex mechanical process involving repeated heating and very severe mechanical deformation, known as tempforming.

The resulting steel appears to achieve a combination of strength and toughness that is ___33__ to that of modern steels that are very rich in alloy content and, therefore, very expensive.

Kimura’s team intends to use its tempformed steel to make ultra-high strength parts, such as bolts. They hope to reduce both the number of ___34__ needed in a construction job and their weight – by replacing solid supports with ___35__ tubes, for example. This could reduce the amount of steel needed to make everything from automobiles to buildings and bridges.

A) abruptly I) cracked

B) additives J) fractures

C) approach K) hollow

D) ardently L) relevant

E) besieged M) reshuffled

F) channel N) strived

G) comparable O) violent

H) components

【答案】AJBEI NCGHK

【详解】

26. 这个句子结构是完整的，缺修饰成分，副词修饰动词，所以填副词。故选项定位懂啊A和D，根据句意，大多数的钢铁在温度低于-25℃时会突然变得易脆，除非它们与其它金属混合。故答案为A abruptly突然地。

27. a novel type of steel has been developedthat resists ___27__我们开发了一种新的钢铁，怎样的钢铁呢?后面是定语从句，resist ____，所以这个空缺宾语，填名词。根据句意，应为J fractures折断。

28. expensive _____，填名词，根据句意，应填B additives添加剂。

29. 前面是冠词，后面是名词，此处填形容词，根据句意，答案应为E besieged，被包围的。

30. 这句话缺谓语动词，根据句意，数百艘船的钢铁外壳在冰冷的北大西洋中裂开，12艘船裂成两半，沉没。填cracked，撞击，破裂。

31. have done，完成时态，需要填过去分词。strive to do 固定搭配，努力做某事，这里指“科学家们一直在努力寻找一种解决方案，将钢铁与镍等昂贵金属混合使用。”，故选项N正确。

32. 这个空缺单数名词，使用一种方法。故选项C approach正确。

33. 缺形容词，be comparable to 和……比得上的

34. 缺名词，components，组成部分。

35. with _____ tubes，缺形容词。用空的管子代替坚硬的支撑，hollow 空的。

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