英语六级听力练习题音频十一_大学英语听力

　　Either way you have to have them back here by six.

　　Q: When must the boats be returned?

　　10. M:Good morning,madam.What can I do for you?

　　W: Id like an estimate for repairing my emergency brake.

　　The car rolls when I park it on a hill.

　　Q:Where does the conversation most probably take place?

　　Sectio B

　　Passage One

　　One of the primary materials used in the construction of buildings and roads is cement

　　a powder made primarily from limestone and clad.

　　Even though the ancient Egyptians and Romans used a kind of cement,it was not until 1824 that an English bricklayer develope

　　a cement strong enough for modern roads and buildings.

　　While experimenting in his kitchen

　　the bricklayer found that a mixture of limestone and clad

　　that had been heated together formed a hard

　　stone like chunk as it cooler

　　When this substance was ground into a find powder it could be stored indefinitely.

　　When the powder was mixed with water

　　it made an excellent quality of cement that quickly hardened in sunlight or even under water.

　　With only a few variations

　　this is how cement is made today.

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