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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  83
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、By grinding heated limestone (石灰石) and clay and mixing them with water.
B、By mixing limestone, clay and water.
C、By grinding limestone and clay under water.
D、By burying limestone and clay underground.
答案 A
解析 事实题。浏览选项可知，本题问的是做某件事的“方式”，听录音时要捕捉到这个相关的信息，并做好标记。水泥制造工序中的关键词为grind，heated，mixed和water，在正确答案A中都得以体现。其他选项不完整或是词语的胡乱拼凑。
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