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  3. [originaltext] One of the important materials used in the construction of bu

[originaltext] One of the important materials used in the construction of bu

游客2024-02-23  77
问题  
One of the important materials used in the construction of buildings and roads is cement. It is a powder made mainly from limestone and clay.  Even though the ancient Egyptians and Romans used a kind of cement, it was not until 1824 that an English bricklayer developed cement strong enough for modern roads and buildings.
    While the bricklayer was experimenting in his kitchen, he found that a mixture of limestone and clay that had been heated formed a substance. This substance became hard and stone-like as it cooled. When it was grounded into a fine powder, it could be stored.
    When the powder was mixed with water, it made an excellent quality of cement that quickly hardened in sunlight or even under water, it made an excellent quality of cement that is used today.
选项 A、An Egyptian.
B、A Roman.
C、A British.
D、A man named Blake.
答案 C
解析 事实题。本文介绍水泥是如何发明的。通过浏览选项可知本题问的是“这个人是淮”，明白这点后，听录音时就要在相应的选项旁做好标记。古埃及人和古罗马人早就使用类似水泥的建材，但是现代人使用的水泥是1824年一个英国砖匠在厨房里发明的。参见原文，“．．．it was not until 1824 that an English bricklayer developed cement strong enough for modern roads and buildings．”正确答案为C。
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