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1、Unit 2 Working the land Period 4 Using Language课后阅读作业. 阅读理解APeople used to think that wetlands were wasted land. Developers would drain them with ditches(水沟), fill them in with tons of soil, and build houses, schools, and parking areas on them. Then scientists began to realize the important role wet
2、lands play in the environment. Wetlands act like giant sponges(海绵)during storms. They soak up extra storm water and afterward release it slowly back into the water cycle. This helps prevent flooding. Towns where people have drained wetlands have found that in a big storm, their streets and homes are
3、 often flooded because there are no wetlands to soak up the excess water. Wetlands also act as giant filters where pollutants are absorbed and dissolved over time. Though wetlands can become polluted from dumping, wastewater, and fertilizer runoff from farm fields, they are able to process some poll
4、utants over time because of all the microorganisms and plants living there. Wetlands are especially important for providing homes and breeding grounds to millions of birds, fish, and amphibians worldwide. Many wetlands have become national wildlife refuges(避难所), where you can go to take pictures and
5、 look at birds and animals. The Everglades are a huge wetland that once covered more than four million acres of southern Florida. Sometimes called the“river of grass”, the Everglades are a shallow sheet of water that slowly flowed across a grassy plain. In the late 1800s people began draining parts
6、of the Everglades for development. Roads were built and towns sprang up. The Everglades shrank to half its original size. Cities like Miami grew up where once there was a thriving wetland. Sewage and waste from the cities were pumped into the remaining wetlands. Over time scientists began to see the
7、 importance of the Everglades. Even with its smaller size, the Everglades filtered the pollutants coming from the cities, absorbing the worst of it like a sewage treatment plant. During storms the Everglades protected the cities from storm surge flooding. They also are just a great place to visit an
8、d see wildlife. 【语篇概述】本文讲述了湿地的重要性。1. The first paragraph is intended to tell us_. A. wasted land used to be wetlandsB. people didnt know the importance of wetlands beforeC. wetlands used to be left undisturbedD. wetlands can be used for building【解析】选B。推理判断题。文章第一段说明, 人们原先认为湿地就是荒废的土地, 因此在那里乱搭乱建, 说明人们原
9、先对湿地的重要性认识不足。2. Why can wetlands be compared to giant sponges? A. They absorb extra water from storms. B. They become large or small in size. C. They absorb pollutants and dissolve them. D. They are made of soft soil. 【解析】选A。细节理解题。从文章第二段可知, 湿地可以像海绵一样, 吸收暴雨中的雨水。3. As for the importance of wetlands, h
10、ow many aspects are mentioned in the passage? A. Two. B. Three. C. Four. D. Five. 【解析】选B。细节理解题。从文章第二段到第四段, 每段说明了湿地重要性的一个方面。4. The example of the Everglades is given in the last paragraph to show_. A. the threat to wetlandsB. the protection of wetlandsC. the development of wetlandsD. the importance o
11、f wetlands【解析】选D。推理判断题。分析文章最后一段, 本段通过美国the Everglades的例子说明, 由于受到人类活动的影响, 湿地面积减少, 但仍然发挥着十分重要的作用, 强调湿地的重要性。BMosquitoes have an extraordinary ability to target humans far away and fly straight to their unprotected skin. Regrettably, mosquitoes can do more than cause an itchy(发痒的)wound. Some mosquitoes
12、spread several serious diseases, including Dengue, yellow fever and malaria. Over one million people worldwide die from these diseases each year. New research now shows how mosquitoes choose who to bite. Mosquitoes need blood to survive. They are attracted to human skin and breath. They smell the ca
13、rbon dioxide gas, which all mammals breathe out. This gas is the main way for mosquitoes to know that a warm-blooded creature is nearby. But mosquitoes also use their eyes and sense of touch. Michael Dickinson is a professor at the California Institute of Technology. His research shows how these sma
14、ll insects, with even smaller brains, use three senses to find a blood meal. Michael Dickinsons team used plumesa material that rises into the air of carbon dioxide gas into a wind tunnel. They then used cameras to record the mosquitoes. The insects followed the plume. Then, the scientists placed da
15、rk objects on the lighter colored floor and walls of the tunnel. Mr Dickinson said, at first, the mosquitoes showed no interest in the objects at all. “What was quite striking and quite surprising is that the mosquitoes fly back and forth for hours. These are hungry females and they completely ignor
16、e the objects on the floor and wall of the tunnel. But the moment they get a bit of CO2, they change their behavior quite obviously and now would become attracted to these little visual blobs(斑点). ”This suggested to the researchers that a mosquitos sense of smell is more important in the search for food. Once mosquitoes catch a smell of a human or animal, they
