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英語專業(yè)八級練習題及答案解析

　　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.

英語專業(yè)八級練習題及答案解析

　　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__

　　答案：

　　1 改like為as.describe sth as sth 是把……描述成……的意思。

　　2 改heating為heated.在時間，條件，讓步等狀語從句中，當從句主語和主句主語是一致的`時候，可以將從句的主語和be的變化形式省略。

　　3 改with為of.be composed of 意思為“包括，由……組成”

　　4 改is made up 為 are made up.which 指代上文中的 the gas， the liquid，and the solid，表示復數概念，所以要用are

　　5 將第一個will去掉,在時間條件狀語從句和條件狀語從句中要用現(xiàn)在時表示將來時。

　　6 by改為when.when warm 相當于 when it is warmed

　　7 改so為such.

　　8改with為to.短語familiar to 后面才能接“某人” familiar with 是接sth

　　9改requiring為required.過去分詞短語作后置定語時，和被修飾的名詞時邏輯動賓關系。

　　10 have 后加 been.動詞give和主語three states 是動賓關系

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