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题库 / OG2021-SC-931
Unlike historical evidence of weather patterns in other regions of the world, which scientists find abundantly represented in tree rings, ancient glacial ice, or layers of sediment from seasonal plankton, the North Pole's clues about its past climates are almost nonexistent.
the North Pole's clues about its past climates are almost nonexistent
the North Pole does not offer many clues as to its past climates
clues to the past climates of the North Pole are almost nonexistent
there are few clues about past climates for the North Pole
the past climates of the North Pole do not offer many clues
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unlike。。。后面historical evidence可以平行的选择 就是clue
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