Dùng từ đã cho viết thành câu hoàn chỉnh
1.All sounds are not noise.Noise is any sound that is unwanted and goes beyond its certain limit,for example,abive 80 decibels (because)
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2.More and more noise is created by modem civilization.It has now become a major environmental pollutant,especially in urban areas. (So)
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3.Contamination in the air happens.There is acid rain which damages soil,vegetation and aquatic life of the region. (Causes)
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4.Water pollution gets more serious in the future.It affects the development of economy and society. (If)
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5.The soil is poisoned because farmers use too many pesticides and herbicides. (If)
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