【正确答案】[译文]不久的将来，人类将会迈着巨人般的步伐离开地球到月球访问，去领略身体失重，没有上下之分的感受。

【答案解析】[要点]It is not(was not，will not be)long before...意为“没过多久就…”，例如：It wasn't long before he told us about this affair．(过了不久他就给我们讲了这件事。)注意区别：It is(was，would be)+时间+before...意为“…(之后)才…”，如：It would be months before he was fit for work．(过几个月以后，他才会适应工作。)