题目

在水平面上有A、B两物体，通过一根跨过滑轮的不可伸长的轻绳相连，现A物体以vA的速度向右匀速运动，当绳被拉成与水平面夹角分别为α、β时（如图3所示），B物体的运动速度vB为（绳始终有拉力）               （    ）     A．vAsinα/sinβ                B．vAcosα/sinβ     C．vAsinα/cosβ                D．vAcosα/cosβAround twenty years ago I was living in York. ___ I had a lot of experience and a Master’s degree, I could not find ____ work.I was ____ a school bus to make ends meet（使收支相抵）and ____ with a friend of mine, for I had lost my flat. I had ____ five interviews with a company and one day between bus runs they called to say I did not ___ the job. “Why has my life become so ____?” I thought painfully. As I pulled the bus over to ___ a little girl, she handed me an earring ____ I should keep it ___ somebody claimed it. The earring was painted black and said “BE HAPPY”. At first I got angry. Then it ____ me -- I had been giving all of my ____ to what was going wrong with my ____ rather than what was right! I decided then and there to make a ____ of fifty things I was happy with. Later, I decided to ____ more things to the list. That night there was a phone call for ____ from a lady who was a director at a larger ____. She asked me if I would ___ a one-day lecture on stress (压力) management to 200 medical workers. I said yes.My ____ there went very well, and before long I got a well-paid job. To this day I know that it was because I changed my way of ____ that I completely changed my life.【小题1】 A．As B．Though C．If D．When 【小题2】 A．successful B．extra C．satisfying D．convenient 【小题3】 A．driving B．repairing C．taking D．designing 【小题4】 A．working B．travelling C．discussing D．living 【小题5】 A．prepared for B．attended C．asked for D．held 【小题6】 A．lose B．like C．find D．get 【小题7】 A．hard B．busy C．serious D．short 【小题8】 A．wave at B．drop off C．call on D．look for 【小题9】 A．ordering B．promising C．saying D．showing 【小题10】 A．in case B．or else C．as if D．now that 【小题11】 A．hurt B．hit C．caught D．moved 【小题12】 A．feelings B．attention C．strength D．interests 【小题13】 A．opinions B．education C．experiences D．life 【小题14】 A．list B．book C．check D．copy 【小题15】 A．connect B．turn C．keep D．add 【小题16】 A．her B．a passenger C．me D．my friend 【小题17】 A．hospital B．factory C．restaurant D．hotel 【小题18】 A．listen to B．review C．give D．talk about 【小题19】 A．plan B．choice C．day D．tour 【小题20】 A．operation B．speaking C．employment D．thinking