unit 13 the water planet2(文件)
【正文】 more sensitive to pollution than other areas? Because estuaries act as filters(過濾器 ), many pollutants end up in them. 2. What does density mean in this passage? It means the number of species per area. 3. How do you estuaries affect the water that passes through them? They absorb nutrients and pollutants from water ing inland sources, thus cleaning our water. 5. Why are estuaries important to human beings? ① Estuaries provide both recreation and education for human beings. People can fish, swim and have fun on the beach. Scientists and students have endless opportunities to study a variety of life in the habitat. ② Estuaries also contribute to the economy through tourism and fishing. 1. The passage mainly tells us______. A. how the estuaries form naturally B. why so many cities and towns are built around estuaries C. the living things in the estuaries D. the characters of estuaries and their great effect on living things and human beings 2. The word“habitat”in Para. 2 of the passage probably means______. 3. It’s not stated but we can infer from Passage that______. A. estuaries are the
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