如图所示是C，D两物体运动的x﹣t图像，由图可知（   ）

1928年，苏联开始实施第一个五年计划，并未受到美国人的关注。4年以后这种情况发生变化，美国出版了大量关于苏联的著作，如《俄罗斯的黎明》《俄国今日：我们从中能学到什么？》。当时，苏联吸引美国人的主要是（    ）

美国人白齐文生性喜欢冒险，少年时就有到东方创立一个帝国的梦想，青年时开始周游世界。后来到中国时参加华尔组建的“洋枪队”，后与李鸿章屡有激烈冲突，被李免职。白齐文忿忿不平，投奔了太平天国。1865年，白齐文在厦门海关被清军逮捕。依据当时法规，清政府将把白齐文（    ）

    I was waiting on the station platform for the Tianjin train when a man asked me if I knew the time of the next train to Tianjin. I often had to go there myself, so I knew and told him. A few minutes later an old lady wanted to know whether the train to Shanghai had already left. I knew that it had not, So of course, I told her. Then a girl came to me and asked why the train from Nanjing was late. I just told her that when trains were late, it was usually because something had happened. I was wondering why all these people were asking me those questions when I noticed that I was standing next to a sign that said "Inquiry Office."