as a volunteer?Р Р49. Why do some schools ask kids to spend some time helping others?Р Р50. What’s the purpose of the writer in writing this article?Р РⅤ.词语运用。用方框中所给词的适当形式填空。(每空一词,每词限用一次)。(5分)Рcause, produce,own, harm, dangerР Many people use stoves to keep their homes warm. Scientists are ing worried because most homes burn coal to keep warm and the smoke from these houses is 51 air pollution. There are many 52 things in the smoke. Smoke is mainly made up of a kind of tiny(微小的)little black thing called soot(煤烟). Too much soot will be 53 for both people and environment. Factories 54 most smoke and soot, but the government thinks that all types of burning should be cut down. Home 55 may have to build new stoves in order to follow the new law, or they won’t be able to keep warm in cold days.
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