Fill in each numbered blank with ONE suitable word----- Nội dung dịch tự động từ ảnh ----- III. Fill in each numbered blank with ONE suitable word. Write your answers on the answer sheet, (1.0 point) There are many sources of pollution in our modern world. At present, (1)______ most severe sources are acid rain, car exhaust fumes and oil spills. Factory chimneys give (2) smoke that contains sulfur dioxide and nitrogen oxide. These gases combine with the moisture in the atmosphere to form sulfuric acid and nitric acid. When it rains, these acids in the rain and turn it acidic. Acid rain is thought to be problem of all. It has polluted aquatic life by turning many lakes into lifeless bodies of water. In these areas, there is no limestone in the rocks to neutralize the acid rain (5)_____. One remedy is to pump limestone into the acidic lakes. (6) it is not possible to do this on a large enough scale to the worst save all the lakes. Car exhaust fumes contain carbon monoxide and lead which are highly poisonous. In big cities, the exhaust fumes build up and pose a health hazard human beings. Pollution of the sea by oil threatens (8) life. Much of the oil comes from ships that clean their fuel tanks while at sea. Offshore oil wells also discharge vast of oil into the sea. Pollution of the sea can also be caused by oil spills. An oil spill may occur as a (10) of accidents involving oil tankers. PART D WDITIN |