We are all slowly destroying the earth. The seas and rivers are too dirty to swim in. There is so much smoke in the air that it is unhealthy to live in many of the world’s cities. In one well-known city, for example, poisonous gases from cars pollute the air so much that traffic policemen have to wear oxygen masks.        We have cut down so many trees that there are now vast areas of wasteland all over the world. As a result, farmers in parts of Africa cannot grow enough to eat. In certain countries in Asia there is too little rice. Moreover, we do not take enough care of the countryside. Wild animals are quickly disappearing. For instance, tigers are rare in India now because we have killed too many for them to survive. However, it isn’t enough simply to talk about the problem. We must act now before it is too late to do anything about it. Join us now. Save the Earth. This is too important to ignore. Câu 7. How are the seas and rivers nowadays?        A. are contaminated                                             B. cannot be swum in        C. are dirty enough to swim in                            D. are less dirty than they used to be Câu 8. What do traffic policemen have to do, in one well-known city?        A. They have to cut down many trees.    B. They don’t take enough care of the countryside        C. They have to pollute the air                D. They have to wear oxygen masks. Câu 9. Why do farmers in parts of Africa and Asia not grow enough to eat?        A. Because people cut down many trees        B. Because there are large areas of land that can’t be used        C. Because there is too little rice        D. Because many trees have been polluted Câu 10. Wild animals are……………        A. being protected from natural environment              B. So rare that they can’t survive        C. killed so many that they can’t live in the forests      D. in danger from extinction Câu 11. What’s the best title for the passage?        A. The Environment       B. Conservation          C. Save the Earth    D. Protect the nature