专八英语考试改错练习题2017

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专八英语考试改错练习题2017

　　学习犹如登山，有的人则注重最终目标，有的人则注重前进的过程，不论哪种，都有其各自丰富的内涵，无孰优劣孰之分，只要你觉得适合即可。以下是小编为大家搜索整理的专八英语考试改错练习题2017，希望对正在关注的您有所帮助!更多精彩内容请及时关注我们应届毕业生考试网!

专八英语考试改错练习题2017

　　Most people would describe water like a colorless liquid. They __1__would know that in very cold conditions it becomes a solid called ice and that when heating on a fire it becomes a vapor called steam. __2__However, water, they would say, is a liquid. We have learned that water consists of molecules composed with two atoms of hydrogen __3__and one atom of oxygen, which we describe by the formula H2O.

　　This is equally true of the solid called ice and the gas called steam.Chemically there is no difference between the gas, the liquid, and the solid, all of which is made up of molecules with the formula H2O. __4__This is true of other chemical substances; most of them can exist as gases or as liquids or as solids. We may normally think of iron as a solid, but if we will heat it in a furnace, it will melt and become a __5__liquid, and at very high temperatures it will become a gas. Nothing

　　very permanent occurs when a gas changes into a liquid or a solid.Everyone knows that ice, which has been made by freezing water,can be melted again by warmed and that steam can be condensed __6__on a cold surface to become liquid water. In fact, it is only because water is so a familiar substance that different names are used for __7__the solid, liquid and gas. Most substances are only familiar with __8__us in one state, because the temperatures requiring to turn them __9__into gases are very high, or the temperatures necessary to turn them into solids are so low. Water is an exception in this respect, which is another reason why its three states have given three different names. __10__