A:若在x方向始终匀速运动,则在y方向先减速后加速运动
B:若在x方向始终匀速运动,则在y方向先加速后减速运动
C:若在y方向始终匀速运动,则在x方向一直加速运动
D:若在y方向始终匀速运动,则在x方向一直减速运动
阅读下面这首唐诗,然后完成后面题目。
送别杜审言
宋之问
卧病人事绝,嗟君万里行。
河桥不相送,江树远含情。
别路追孙楚①,维舟吊屈平。
可惜龙泉剑②,流落在丰城。
【注】①孙楚:西晋文学家,名重一时,但“多所凌傲,缺乡曲之誉”,年四十始参镇东军事。②龙泉剑:传说在豫章丰城地下四余丈的地方,曾有一石函,光气非常。中有双剑,一曰龙泉,一曰太阿。
It is early in the morning, about seven o'clock. Peter is on the bus. He's going to school. There are many people on the bus and it is a bit hot. Peter is sitting by a window with a book in his hands. The bus driver is driving slowly(慢地). Most people on the bus are using their mobile phones. A girl in a red sweater is standing near Peter. She looks very happy. She is reading some funny things on her mobile phone. A fat boy behind him is busy playing games on his mobile phone. A tall man is Jack. He is listening to music on the mobile phone. He’s about thirty years old. They are all busy and happy.