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| A.Because the United Nations wanted to reduce road accidents and economic costs |
| B.Because two million people were killed in the accidents . |
| C.Because engineers wanted to design ten new concrete mixtures . |
| D.Because the United Nations made bridges of the new mixtures which could last for about 20 to 35 |
| A.Fly ash | B.Portland cement | C.Sand | D.Chemical |
| A.Ten new concrete bridges have already been built in the United States . |
| B.A new concrete bridge could last 50 more years than an ordinary concrete one . |
| C.People didn’t know how to build with cement until the late 1800s . |
| D.Water and salt won’t do any damage to bridges over time . |
| A.The causes of road accidents . | B.The advantages of fly ash |
| C.The measures of avoiding road accidents | D.Latest information about long-life concrete bridges |
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| A.tell us the results of a certain survey |
| B.a(chǎn)dvertise a certain product |
| C.a(chǎn)dvise men to do more cleaning housework |
| D.tell us which is the hardest job at home |
| A.have different views on house cleaning |
| B.spend different amounts of time and effort on house cleaning |
| C.like to do different kinds of housework |
| D.have different ways to do housework |
| A.the Welsh | B.people in the north-west |
| C.people in the south-east | D.people in the north-east |
| A.a(chǎn)n organization doing research on housework |
| B.a(chǎn) group of experts who give advice on doing housework |
| C.a(chǎn) company providing advice and products on cleaning |
| D.a(chǎn) company providing cleaning services |
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| A.a(chǎn)re all sports lovers | B.behave like children |
| C.like to kick a ball around | D.can remain young all their lives |
| A.They differ in the shape of the ball |
| B.They are played by different numbers of players |
| C.They both can be handled |
| D.They both can be kicked |
| A.Americans love football most of all |
| B.British people love rugby most of all |
| C.Americans and British people may call the same thing differently |
| D.football originated in Britain in the 18th century |
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