上海市2021届高三上学期最新英语试卷精选汇编：完形填空专题

完形填空专题 上海市杨浦区2020-2021学年高三上学期期中统考英语试卷 Section A Directions: For each blank in the following passage there are four words or phrases marked A,B,C and D. Fill in each blank with the word or phrase that best fits the context. Trackers on Ice Just because a scientist puts a GPS tracking collar on a wild polar bear does not mean the animal will willingly keep it on. (41) ____, these huge collars are purposefully loose so that if one becomes annoying, a bear can (42)____it. But scientists have now found a way to use signals from the discarded(丢弃的）devices. “These dropped collars(43)____would have been considered garbage data,” says Natasha Klappstein, a polar bear researcher at the University of Alberta. She and her colleagues instead used(44)____from such collars, left on sea ice in Canada's Hudson Bay, to track the ice itself. For their study, published in June in The Cryosphere, the researchers (45)____twenty collars that sent movement data consistent（与······一致的）with ice drift rather than