【单选题】Passage 2 Questions 6 to 1O are based on the following passage: People all over the world today are beginning to hear and learn more and more about the problem of pollution. Pollution is caused either...
A.
the release of artificial or natural substances into the environment
【简答题】Questions 17 to 20 are based on the following passage. At the end o f the passage, you will be given 20 seconds to answer the questions. Now,, listen to the passage. By what means did Joe think he cou...