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Between 4.5 and 3.8 billion years ago, the earth became so ______ that it was not clear whether the shape would last or not.
A.genuineB.slightC.solidD.violent
D
考查词义辨析,genuine真心的,slight轻轻的,solid 坚固的,violent猛烈地,句意:在4.5到3.8亿年前,地球变得如此的猛烈以至于不清楚形状是否会不会持久。故选D。
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