问题
选择题
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．genuine
B．slight
C．solid
D．violent
答案
答案：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。