题目内容

【题目】Scientists can't explain (appear) of dinosaurs correctly. They are trying their best to find the reason.

【答案】disappearance
【解析】：科学家不能正确解释恐龙的消失, 他们正在尽自己最大的努力找到这个原因。此处explain是及物动词，后跟名词作宾语，所以用 disappearance.

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