... the piano for five years. THE END ĐỀ ĐỀ NGHỊ KIỂM TRA HK I NĂM HỌC 2010 – 2011 TIẾNG ANH 12 – TEST 7 I. Choose A, B, C or D that best completes the following passage. In the United ... and hence difficult to control. 9. This passage is mainly about_________. A. air pollution that is another effect of acid rain. B. the phenomenon of air pollution. C. acid rain that is one of ... contaminated and this has led to the disappearance of some species of fish in Europe, USA . Because the contaminants are carried long distances, the sources of acid rain are difficult to pinpoint...