Unit 2 单元话题完形填空专项练习-2022-2023学年高二英语选择性必修第一册单元重难点易错题精练（人教版2019）

Unit 2单元话题完形填空专项练习 (名校最新真题) （2022·重庆八中高二月考）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.   ___1___, these huge collars are purposefully loose so that if one becomes annoying, a bear can ___2___it. But scientists have now found a way to use signals from the discarded(丢弃的)devices. “These dropped collars___3___would have been considered garbage data,” says Natasha Klappstein, a polar bear researcher at the University of Alberta. She and her colleagues instead used___4___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 ___5___twenty collars that sent movement data consistent(与······一致的)with ice drift rather than polar bear ___6___between 2005 and 2015. The resulting records of how melting ice typically drifts in Hudson Bay are unique; there are no easily ___7___on-the-ground sensors, and satel