模拟限时练9-【金版教程】2023高考英语大二轮专题复习冲刺方案全书word（新教材，创新版）

模拟限时练(九) (时间：40分钟) Ⅰ.阅读 A (2022·河南省百所名校高三第三次学业质量联合检测)A study showed that farms with surrounding natural habitat experienced the most benefits from birds. The study, published in Journal of Applied Ecology, was conducted at 21 strawberry fields along California's Central Coast. It found that birds were more likely to carry foodborne pathogens (病原体) and eat more berries without surrounding natural habitat. The study looked at how different farming practices influenced the costs and benefits that wild birds provided on the strawberry farms. The scientists combined nearly 300 bird surveys and the tests of more than 1,000 droppings' samples from 55 bird species to determine which birds ate pests, beneficial insects and crops, and carried foodborne pathogens. They also ranked birds to see which were more likely to bring benefits or costs to farmlands. Barn swallows, for instance, got a “gold star” in the study. Their mud nests are commonly seen attached to the underside of eaves (屋檐), from which they fly out to fields, searching for insects. Rather than result in a list of “good” and “bad” birds, the study found that most bird species brought both costs and benefits to farms, depending on how the landscape was managed. The presence of natural habitat was the single most important driver differentiating a farm where wild birds brought more benefits than harm. Growers will tell you it's impossible to keep birds off your farm—you can't do that and don't want to from a conservation perspective. “Nature is messy and birds are complex，” the researcher said. “The best we can do is understand how to take advantage of the benefits while reducing the harm.” A related study in 2020 found that farms with natural habitat attracted more insect­eating birds and fewer strawberry­eating birds. Such habitats also bring greater numbers of bird species to the landscape. All together, these studies suggest that farming landscapes with natural habitat tend to be good for conservation, farme