语法 24 Glaciers

gedn01

3796 325.Geologists believe that the Bering land bridge, over which human beings are thought to have first entered the Americans, disappeared about 14,000 years ago when massive glaciers melted and caused the sea level to rise several hundred feet worldwide. (A) are thought to have first entered (B) were thought first to enter (C) were thought at first to enter (D) are thought of as first entering (E) were thought to first enter OA:A

1257 70. His studies of ice-polished rocks in his Alpine homeland, far outside the range of present-day glaciers, led Louis Agassiz in 1837 to propose the concept of an age in which great ice sheets had existed in now currently temperate areas. A.in which great ice sheets had existed in now currently temperate areas B.in which great ice sheets existed in what are now temperate areas C.when great ice sheets existed where there were areas now temperate D.when great ice sheets had existed in current temperate areas E.when great ice sheets existed in areas now that are temperate OA:B

4254 783.The most favorable locations for the growth of glaciers, rather than being the cold, dry polar regions, would be instead the cool, moist middle latitudes, where there is abundant precipitation and where it is cold enough to allow some snow to accumulate year by year. (A) glaciers, rather than being the cold, dry polar regions, would be instead the cool, moist middle latitudes (B) glaciers are not the cold, dry polar regions but the cool, moist middle latitudes (C) glaciers are the cool, moist middle latitudes rather than the cold, dry polar regions (D) glaciers, instead of being the cold, dry polar regions, would be the cool, moist middle latitudes (E) glaciers are, instead of the cold, dry polar regions, rather the cool, moist middle latitudes OA:B

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rebecca_wang

顶，牛人啊~