Question

【题目】Steel is a hard metal that people use to make many different products. Car bodies, bridges, building frames, and containers are just a few of the things made from steel. 【1】 But steel is better than iron in many ways. Steel is stronger but lighter than iron. Steel also lasts longer than iron.

【2】 Then they add carbon to the liquid iron. They may also add other materials to make different types of steel. For example, steel with added chromium（铬）is called stainless steel. It will not rust（生锈）or stain. Finally, workers use machines to cool the liquid steel into bars or long sheets. 【3】

People made the first steel as early as 1400 BC. Ancient people heated iron inside a pile of burning charcoal（木炭）. 【4】. The result was not the same as modern steel, but it was stronger than regular iron.

In the 1800s people began to use huge ovens to make large amounts of steel. In the late 1800s builders used steel to make some of the first skyscrapers. 【5】. In the 1900s new processes made steel-making easier. Today steel remains one of the most popular building materials in the world.

A. This added carbon to the iron.

B. Steel is quite different from iron.

C. The hardened steel may then be made into products.

D. Steel is basically iron mixed with a little carbon.

E. Then they will be cooled and put on the market.

F. To make steel, workers hear iron until it melts.

G. They also used steel to make large, modern bridges.

Answer 1

【答案】

【1】D

【2】F

【3】C

【4】A

【5】G

【解析】这是一篇叙述文。本文主要讲了钢的制作过程，历史，以及钢的作用。钢在现代的作用越来越大。

【1】上一句提到了钢，下一句提到钢与铁的比较，所以该句是承接下文，表达的是钢与铁的关系。D选项“钢是含有少量混合物的铁。”切题。

【2】该句是标题句。下文主要讲的是钢是如何制成铁的。所以F选项“为了制作钢，工人们要加热直到铁融化。”切题。F中的to make steel与文中的 to make different types of steel.相呼应。

【3】上一句提到“工人们使用机器将钢水冷却成条形或长条形。”而接下来这些钢将会被制成产品。所以C选项“更坚硬的钢可能后面会被制成产品。”切题。

【4】上一句提到“古代人在一堆燃烧的木炭（木炭）里面加热铁。”所以铁里含有碳。A选项“这把碳加入了铁中。”切题。

【5】该段讲了钢的作用。上一句提到了钢可以制造摩天大楼。所以该句也应是钢的作用。G选项“他们也用钢制作大的，现代的桥。”切题。