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段最后1句可知，千万种碳氧化合物得以形成的原因是在他们的分子组成中这两个原子有许多不同的组合位置。----------------------------------------3Which ofthe following is true? ( ) A.The various petroleum products are produced by filtration．B.Heating and condensation produce the various products．C.Chemical separation is used to produce the various products．D.Mechanical means such as the centrifuge are used to produce the various products． 参考答案： B 由第四段最后1句“The various petroleum products are refined from the crude 0il bv heating and eonden．sing the vapors”可知，加热和冷凝生产出不同的产品。----------------------------------------4How is crude oil brought to the surface? ( ) A.Expansion of the hydrocarbons．B.Pressure and pumping．C.Vacuum created in the drilling pipe．D.Expansion and contraction of the earth’s surface． 参考答案： B 原油是怎样被弄到地表的?由第一段“Pressure at the souree or pumping forces crude oil to the surface”可知，经由原油端处的压强和泵的抽压力使得原油被送输到地表。----------------------------------------5Which of the following is not listed as a light oil? ( ) A.Distillate oil B.Gasoline．C.Lubricating oil．D.Kerosine． 参考答案： C 由第四段第2句“．．．such as gasoline，kerosine…”可知，原油经加热和冷凝后的产物称为轻油，包括汽油、煤油、馏出油。C项润滑油不包括在内。----------------------------------------1、…to have good manners you must be able to accept courtesy，receive it gladly，rejoice when it comes your way． ( ) A.When you get good manners by chance，you should accept it，receive it and show our rejoicing．B.When someone treats you with bad manners，you should accept it with good manners．C.You should cheerfully accept any manners which you experience．That means you have good manners．D.When you have good manners，you can receive everything gladly． 参考答案： A When you get good manners by c
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