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）.docx

Unit 2单元话题完形填空专项练习 (名校最新真题) （202 2 ·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 satellite observations often cannot ___8___ capture the motion of small ice sheets. The team compared the discarded collars' movements with widely used ice-drift modeling data from the U.S. National Snow and Ice Data Center (NSIDC). Collar data indicated that the NSIDC model underestimates the speed at which ice moves around in Hudson Bay--as well as the overall ___9___ of drift. Over the course of several months the model could drift away from an ice sheet's location by a few hundred kilometers, the researchers say. This means the bears may be working harder, when moving against the direction of the ice, than scientists had     ____10____ .“Since we're underestimating the speed of drift, we're likely underestimating the energetic effort of polar bears," says Natasha Klappstein. The research reveals ____11____ insight (洞悉) into how highly mobile ice moves. As melting increases in coming years, such ice will likely become more