题目内容

A．By grinding heated limestone （石灰石) and clay and mixing them with water.B．By mixin

A. By grinding heated limestone (石灰石) and clay and mixing them with water.
By mixing limestone, clay and water.
C. By grinding limestone and clay under water.
D. By burying limestone and clay underground.

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听力原文： 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.
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An Egyptian.
B. A Roman.
C. A British.
D. A man named Blake.

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B. Easygoing
C. Intelligent
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当债券的卖出价或者偿还额大于买入价时，资本利得为负。 ()

A. 正确
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