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苏科版八年级下册数学课本第116页答案

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解：(1)方程两边同乘x- 1，得4+x-5（x-1）=2x，解这个方程得x=3/2．检验：当x=3/2时，x-1=1......

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阅读理解。 Many cities around the world today are heavily polluteD.Careless methods of production and lack ofconsumer demand for environment (环境) friendly products have contributed to the pollution problem.One result is that millions of tons of glass, paper, plastic, and metal containers are produced, and theseare difficult to get rid oF. However, today, more and more consumers are choosing green and demanding that the products theybuy should be safe for the environment.Before they buy a product,they ask questions like these: Will thisshampoo damage the environment? Can this metal container be reused or can it only be used once? A recent study showed that two out of five adults now consider the environmental safety of a productbefore they buy it. This means that companies must now change the way they make and sell their productsto make sure that they are green, that is,friendly to the environment. Only a few years ago, it was impossible to find green products in supermarkets,but now there arehundreds.Some supermarket products carry labels (标签) to show that the product is green. Somecompanies have made the manufacturing (生产) of clean and safe products their main selling point andemphasize it in their advertising. The concern for a safer and cleaner environment is making companies rethink how they do business.No longer will the public accept the old attitude of Buy it, use it,throw it away, and forget it. The publicpressure is on, and gradually business is cleaning up its act.1. It becomes clear from the text that the driving force (动力) behind green products is _____.A.public caring for the environmentB.companies,desire for bigger salesC.new ways of doing businessD.rapid growth of supermarkets2. What would be the best title for the text?A.Business and PeopleB.Business Goes GreenC.Shopping Habits Are ChangingD.Supermarkets and Green Products3. The underlined word it in the fourth paragraph refers to _____.A.a selling pointB.the company nameC.a great demand for health foodsD.the manufacturing of green products4.Which of the statements is true according to the passage? ( )A、Only the productive methods are the cause of the heavy pollution.B、Manufactures made their products clean with cleaners.C、In fact, it is the public who made the companies produce green products.D、Not all the consumers would like green products.5.The attitude of the public to the products is now ( ).A、progressive (积极的)B、harmfulC、interestingD、expensive

A.Careless
B.Before
C.Some
D.
No
E.1.
F.A.G.A.H.Which
I.
B、Manufactures
J.
C、In
K.
D、Not
L.
5.The
M.
A、progressive

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A.整理、整顿、润滑、安全
B.整齐、清洁、打磨、安全
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