EverytimeweturnontheTVortakearideinacar，wecouldbeaddingtoaproblemcalledacidrain（酸雨）．Inthisarticle，we'lllearnsomethingimportantaboutacidrain．TheformationofacidrainWhenpeopleusefuels（燃料），s

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），poiso nous 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 rainWhen fuels，such as c oal and gasoline are burnt，harmful gases are sent into the air．When these gases （1）___with rain，acid rain forms．
The harm of acid rainAcid rain is greatly （2）___ to the environment．It makes our rivers，ponds and lakes and oceans dirty and （3）___ 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（4）___．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  （5）___to our kids．

Answer 1

1．mix；考查动词用法，根据原文句子 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．当人们使用燃料，例如煤和汽油，有毒的气体释放出来．当这些气体和雨一起混合是，酸雨形成了，所以填"混合"mix．
2．harmful； 考查形容词用法，根据原文句子Acid rain destroys everything that it touches．酸雨摧毁了它接触的每个事物．所以酸雨对环境时有害的，故填有害的harmful．   
3．causes；考查动词用法，根据文章信息    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．它毒害了我们的河流，池塘和湖泊连同里面的生命．它污染了我们的土壤和庄家，危害树木，甚至能杀害鱼和植物．所以酸雨造成了鱼和植物的死亡，故填"引起，造成"cause，and 前面的动词用三单，所以要填causes．
4．necessary；考查形容词用法，根据原文句子We need to reduce and even stop the pollution that gets into our air．我们需要减少甚至停止污染进入我们的空气．所以阻止污染进入空气是有必要的，有必要的 necessary．
5．difference；考查名词用法，根据原文信息But people everywhere can take small steps now to help protect our environment for future generations．但是现在人们无论在哪里都能够做一小步去帮助我们下一代保护环境，所以我们做一小步都会对我们的下一代有影响，有影响，make d difference，故填difference．