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
考查詞義辨析，genuine真心的，slight輕輕的，solid 堅(jiān)固的，violent猛烈地，句意：在4.5到3.8億年前，地球變得如此的猛烈以至于不清楚形狀是否會(huì)不會(huì)持久。故選D。
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