【简答题】Why did the Federal Aviation Authority require the black boxes be painted orange or yellow? A) To distinguish them from the colour of the plane. B) To conform. to international standards. C) To make t...
【单选题】听力原文:M: Did you watch undersea Discover), last night? W: No, I missed it. Did you? M: Yeah, it was pretty good...It was about barnacles. W: Hmm. M: You know how they stick themselves to stuff in the o...