题目内容
（请给出正确答案）
[主观题]
The author's explanation of how deep events occur would be most weakened if which of the f
ollowing were discovered to be true？
A．Deep events are far less common than shallow events.
B．Deep events occur in places other man where crustal plates meet
C．Mantle rock is more ductile at a depth of several hundred kilometers than it is at 50 kilometers.
D．The speeds of both P and S waves are slightly greater than previously though.
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