Question

【题目】The ________（possible）that there is life on other planets has always encouraged scientists to explore outer space.

Answer 1

【答案】possibility

【解析】

句意：其他行星上可能存在生命，这一直鼓励科学家探索外层空间。

根据题干可知“that there is life on other planets”是同位语从句，“The…”在句中作主语，所以要填“possible”的名词形式。故填possibility。