Прочтите текст "acid rains " и выберите единственно правильный ответ. acid rains every year more and more plants and animals disappear never to be seen again. strangely, it is the most intelligent but most thoughtless animal that is causing most of the problems — man. nature is very carefully balanced and if this balance is disturbed, animals can disappear alarmingly fast. every day, thousands of species of animals draw closer to extinction. there are countless number of species which may become extinct before they are even discovered. in many lakes the fish are dying. fishermen are worried because every year there are fewer fish and some lakes have no fish at all. scientists are beginning to get worried too. what is killing the fish? the problem is acid rain. acid rain is a kind of air pollution. it is caused by factories that burn coal or oil or gas. these factories send smoke high into the air. the wind often carries the smoke far from the factories. some of the harmful substances in the smoke may come down with the rain hundreds of miles away. the rain in many places isn't natural and clean any more. it's full of acid chemicals. when it falls in lakes, it changes them too. the lakes become more acidic. acid water is like vinegar or lemon juice. it hurts when it gets in your eyes. it also kills the plants and animals that usually live in lake water. that is why the fish are dying in lakes. but dead fish may be just the beginning of the problem. scientists are finding other effects of acid rain. in some large areas trees are dying. not just one tree here and there, but whole forests. at first scientists couldn't understand why. there were no bugs or diseases in these trees. the weather was not dry. but now they think that the rain was the cause. acid rain is making the earth more acidic in these areas. some kinds of trees cannot live in the soil that is very acidic. now scientists are also beginning to study the effects of acid rain on larger animals. for example, they believe that some deer in poland are less healthy because of acid rain. if deer are hurt by the rain, what about people? this is the question many people are beginning to ask. no one knows the answer yet. but it is an important question for us all. вопросы к тексту: 1. this passage is about (a) fishing. (b) acid rain. (c) air pollution. (d) destructive human activity. 2. every year thousands of species of animals (a) are hunted for their meat and skins. (b) migrate to other places. (c) starve to death. (d) die out. 3. acid rain is caused by (a) natural gas. (b) the ozone layer depletion. (c) acidic lake water. (d) emissions of industrial enterprises. 4. which of the following is true? (a) dead fish in lakes is the only problem caused by acid rains. (b) scientists are sure that acid rains are not harmful for mankind. (c) if we don't make an attempt to stop acid rains we may never see some animals again. (d) there's no reason to worry about several trees that died of some unknown disease. 5. what was not mentioned in the text? (a) acid rain is capable of dissolving some rocks and stones. (b) fish are unable to live in the water containing acidic chemicals. (c) coal, oil or gas form dangerous combinations after being burnt. (d) scientists reckon that if some larger animals can be affected by acid rains, people may be in great danger. 6. factory smoke (a) stays over the factories. (b) is usually clean now. (c) turns into air. (d) can travel hundreds of miles. 7. scientists think acid rain (a) is killing people. (b) helps kill bugs. (c) fertilizes the soil. (d) is killing trees.