题目

如图，在棱长为的正方体中，异面直线与所成的角等于（    ） A．   B．C．D． 答案：D　　One day, in Philadelphia, three men walked into the 1 Street Station. One of them went to the Information Center to check the departure-arrival listings (一览表). There he 2 that the three 3 train to New York was going to leave an hour later that day. 　　When he told his friends about the 4 , they 5 that they all go to a nearby bar to wait. So off they went. 　　About an hour 6 , they returned to the station laughing and talking. When they arrived at the right 7 , they saw the train was already moving slowly out of the station. 　　All the three men ran 8 the train shouting, “Wait! Wait! Come back!” Two of them 9 up with the last car, grabbed (抓住) the railing (扶手) of the back platform (车厢后门台), pulled themselves up, and got on the moving train. 10 this time, the third man had stopped 11 . As he hopelessly watched the train 12 out of the station, he could still see his friends wave and 13 them call. 14 he had a confused (迷惑的) look on his face. Then after a short 15 , he turned a way and slapped (掌击) his knee as he laughed 16 laughed. 　　A man 17 nearby, who had seen it all, 18 him and asked, “What's so funny (可笑的) fellow? After all, your two friends made it and you didn't.” 　　The man was still laughing so hard 19 he had tears in his eyes as he replied, “You don't understand. Those two fellows came to 20 .” 1． [　　] A．ThirtyB．Thirtyth C．ThirtithD．Thirtieth 2． [　　] A．found outB．noticed C．foundD．founded 3． [　　] A．o'clockB．o'clock's C．hoursD．hours' 4． [　　] A．delay (延期)B．accident C．ticketsD．lateness 5． [　　] A．suggestedB．wished C．hopedD．advised 6． [　　] A．lateB．later C．afterD．before 7． [　　] A．stopB．track (铁轨) C．stationD．way 8． [　　] A．onB．up C．fromD．after 9． [　　] A．putB．ran C．wentD．caught 10． [　　] A．ByB．Till C．AtD．Since 11． [　　] A．to runB．run C．ranD．running 12． [　　] A．pulledB．pulls C．pullD．be pulled 13． [　　] A．hearB．listen to C．watchD．understand 14． [　　] A．At firstB．First C．At the firstD．First of all 15． [　　] A．momentB．minute C．movementD．example 16． [　　] A．orB．and C．afterD．but 17． [　　] A．standB．stands C．standingD．stood 18． [　　] A．turned toB．turned on C．turned offD．turned around 19． [　　] A．whenB．before C．thatD．as 20． [　　] A．see me offB．send me up C．meet me sayD．hello to me