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题目内容
题目材料：
The consensus among early-twentieth-century- geologists that continents did not drift collide, or fragment was so strong that contentions about continents' mobility from the tune of Wegener (1924) and Holmes (1929) were initially rejected by the overwhelming majority. It is sometimes argued that this rejection was based on lack of mechanisms for such large-scale crustal mobility; but this is incorrect. There was a wide debate about possible mechanisms for continental drift, and m tact Holmes had laid out a remarkable account that foreshadowed plate tectonics. It was not until the 1960s. however, that new observations by geophysicists of symmetric sea floor stripping started a shift towards acceptance of the plate tectonics theory, generating many testable predictions that profoundly affected the Geld of geology.
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