阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项。 I was coaching girls’ track in Iowa and there was a young discus（铁饼）thrower on the team with 36 potential（潜力）. Here goes her story. At the end of our training 37 the district track meet, this discus thrower, Lucy, asked me if she 38 come to the school on Sunday for a little 39 training. I agreed. The year before, she had placed second at the district meet and 40 missed going to the state meet. She had won every discus event, 41 that district meet! And, her throws in the competitions had 42 been between 106’1” and 110’10”. Something began to 43 me. Why couldn't Lucy 44 to get the discus to 111 feet? I wondered if it was more a psychological barrier（心理的障碍） 45 a physical one. I decided to try something 46 . I made up my mind to 47 to Lucy. On Sunday, after her drills, I said, “Why don’t you throw five or six good ones for me to 48 ?” She began to throw again, but 49 were farther than what she had already thrown. But, I didn’t tell Lucy. As I was measuring the 50 one, I pulled out some more tape (量尺) and yelled out to her, “ Come to see this! This one is 51 ! ” It wasn’t. Lucy, thinking that this was a personal best, jumped wildly into the air in 52 . The next afternoon, at the district meet, Lucy 53 with a personal best throw of 114’10”! Just 24 hours after I had lied to her. However, this time she had 54 thrown the discus four feet further than she had ever thrown it before. Sometimes we 55 our own barriers in our mind. So learn to take control of your mind. 21．A. little          B. great           C. no              D. limited 22．A. after           B. during          C. since           D. before 23．A. could           B. must           C. should         D. would 24．A. helpful        B. extra          C. real           D. regular 25．A. luckily         B. completely     C. narrowly        D. probably 26．A. except         B. including      C. despite        D. with 27．A sometimes       B. always         C. never          D. seldom 28．A. frighten       B. please         C. shock          D. bother 29．A. seem           B. pretend        C. need           D. ask 30．A. apart from     B. rather than    C. because of      D. according to 31．A. impossible     B. familiar       C. new             D. easy 32．A. lie            B. turn           C. reply          D. call 33．A. look           B. measure        C. match          D. take 34．A. many           B. all            C. some           D. none 35．A. worst          B. closest        C. first          D. final 36．A. higher         B. farther        C. bigger         D. longer 37．A. excitement     B. anxiety        C. puzzlement     D. anger 38．A. disappeared    B. lost           C. won            D. arrived 39．A. actually        B. hardly         C. nearly          D. only 40．A. break          B. remove         C. take           D. set