EverytimeweturnontheTVortakearideinacar，wecouldbeaddingtoaproblemcalledacidrain（酸雨）．Inthisarticle，we'lllearnsomethingimportantaboutacidrainTheformationofacidrainWhenpeopleusefuels（燃料），such

Question

Every time we turn on the TV or take a ride in a car，we could be adding to a problem called acid rain（酸雨）．In this article，we'll learn something important about acid rain
The formation of acid rain
When people use fuels （燃料），such as coal and gasoline（汽油），poisonous gases are given off．When these gases come together with rain，acid rain forms．Many power stations burn fuels in order to create the electricity（电） that we use in our homes and offices every day．Cars and trucks also send these gases into the air when they burn gasoline．When rain meets these gases，harmful things called acids form．This is acid rain．
The harm of acid rain
Acid rain destroys everything that it touches．It poisons our rivers，ponds and lakes and oceans along with the life in them．It pollutes our soils and crops，harm trees，and can even kill fish and plants．Acid rain also eats away at our buildings．
The prevention of acid rain
We need to reduce and even stop the pollution that gets into our air．Turn off lights，televisions and other electrical appliances（电器） if we are not using them．Walk and take a bike whenever possible．If we are travelling a long distance，take a bus or train to save fuel．
As research shows，acid rain harms our environment．But people everywhere can take small steps now to help protect our environment for future generations．

Whenever we use electricity or drive our cars we may add something bad to the air around us．And even worse，we may cause a terrible problem-acid rain．
The formation of acid rain	When fuels，such as coal and gasoline are burnt，harmful gases are sent into the air．When these gases （54） ___ with rain，acid rain forms．
The harm of acid rain	Acid rain is greatly （55） ___ to the environment．It makes our rivers，ponds and lakes and oceans dirty and （56） ___ the death of fish and plants．And it can corrode （腐蚀） the buildings we live in．
The prevention of acid rain	Trying to prevent the pollution that gets into the air is （57） ___．Keep the electrical appliances off while they are not in use．We can also use different ways of traffic to make less use of fuels．
Research tells us that acid rain harms our environment．So people around the world can take small steps now to make a （58） ___ to our kids．

Answer 1

54．mix，推理判断题，文中在酸雨形成部分写到"When these gases come together with rain，acid rain forms"，当污染气体与雨水结合后，酸雨就形成了．此时句中用到的是together with，意思为将两种物质放在一起，也就是混合，所以填写mix（混合）用来保证句意相同．
55．harmful，推理判断题，文中写到"As research shows，acid rain harms our environment"，根据研究表明酸雨对环境有害，应该填写harm，但此处在空格前是系动词is，且存在副词greatly，可知此处应填写一个形容词，则填写harmful．
56．causes，推理判断题，文中说"It pollutes our soils and crops，harm trees，can even kill fish and plants"，表明酸雨对土壤、树木有害，且能够杀死鱼和植物，原文中用"kill"来表示；在此问题中，空格后为"the death of fish and plants"，已经说出了影响结果，那就是鱼和植物的死亡，所以空格处应填写"导致"，所以填写cause，但此时句子主语为It，所以用第三人称单数causes．
57．necessary，推理判断题，文中原文为"We need to reduce and even stop the pollution that gets into our air"，大意是我们需要减少或停止污染大气，在问题中句子以动名词形式作主语，此处缺少修饰词"need"，而位于系动词之后的应为形容词，所以填写necessary．
58．difference，推理判断题，文章中提到"But people everywhere can take small steps now to help protect our environment for future generations．"我们应该为后代保护环境，也就是从现在开始，我们要做出改变，保护我们的世界，做一些有意义的事，为子孙后代留下一个干净的世界，"make a difference"原意指"有区别，做出改变"，在此处符合题意，所以填写difference．