题目

2010年12月18日,中国在西昌卫星发射中心用“长征三号甲”运载火箭,将第7颗北斗导航卫星成功送入太空预定轨道,继2010年10月成功发射“嫦娥二号”,我国又将于2011年上半年发射“天宫一号”目标飞行器,2011年下半年发射“神舟八号”飞船并将与“天宫一号”实现对接,届时将要有航天员在轨进行科研,这在我国航天史上具有划时代意义。“天宫一号”A和“神舟八号”B绕地球做匀速圆周运动的轨迹如图所示,虚线为各自的轨道。由此可知     根据短文内容,将方框中的选项填入短文中,使短文内容完整。A young man and an old man are walking in the park.The old man is behind(在后面) the young man. _【1】__ The old man is very glad to see the chair.He wants to sit on the chair for a rest(休息).The young man walks to it,too. 【2】 Now he is in front of(在前面) the young man.The young man says.“ 【3】 ” The old man doesn’t listen to him.He is sitting on it.He looks happy:The young man comes over to him.He is holding a small board(木板)in his hand.It says,“ 【4】 ”A. Wet Paint.(油漆未干)B. There is a chair in front of (在…前面)the young man.C. Don’t sit on the chair!D. So he begins(开始) to run.
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