题目

For each blank in the following passage thereare four words or phrases marked A, B, C and D. Fill in each blank with theword or phrase that best fits the context.Trackers on IceJust because a scientistputs a GPS tracking collar on a wild polar bear does not mean the animal willwillingly keep it on. 1, these huge collars arepurposefully loose so that if one becomes annoying, a bear can 2it. But scientists have nowfound a way to use signals from thediscarded(丢弃的)devices.These dropped collars3would have been consideredgarbage data, says Natasha Klappstein, a polar bear researcher at theUniv下列旅游点从西向东依次排序的是 [     ]A、九寨沟 苏州园林 张家界 B、峨眉山 黄鹤楼 杭州西湖 C、敦煌莫高窟 泰山 秦始兵马俑 D、武夷山 桂林山水 云南石林