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

【答案】disappearance
【解析】：科學(xué)家不能正確解釋恐龍的消失, 他們正在盡自己最大的努力找到這個原因。此處explain是及物動詞，后跟名詞作賓語，所以用 disappearance.

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