SCIENTISTS AND ENGINEERS HAVE INVENTED FILTERS AND OTHER METHODS OF RE...

Câu 24: Scientists and engineers have invented filters and other methods of removing pollutantsfrom industrial wastes..A. taking away B. taking over C. making out D. making overRead of the following passage and mark the letter A, B, C or D on your answer sheet toindicate the correct word or phrase that best fits each of the numbered blanks We are using up the world’s petroleum. We use (25)____ in our cars and to heat ourbuilding in winter. Farmers use petrochemicals to (26)_____ the soil rich. They use them to killinsects (27)_____ eat plants. These chemicals go (28)____ rivers and lakes and kill the fish there.Thousands of pollutants also go into the air and pollute it. Winds carry this (29)__ air to othercountries and other continents. Poor farmers use the same land over and (30)___ The land needs a rest so it will be betternext year. However, the farmers must have food this year. Poor people cut down forests (31)___firewood. In some areas when the trees are gone, the land (32)____ desert. Poor people can’t savethe environment for the (33)___ . This is not a problem for one country or one area of the world. It is a problem for all-humans. The people and the nations of the world must work together to (34)___ the world’sresources.