题目

如图是一运动员做蹦床运动的一幅图片．针对蹦床运动，从动能与势能相互转化的角度提出一个问题并回答．（不计空气阻力）问题：运动员下落过程中能量转化是怎样的？ 答案：​解：运动员先向上跳起再落向蹦床，运动员的质量没有变化；运动员在起跳时，蹦床的弹性势能转化为运动员的动能；运动员的速度先减小后增大，动能先减小后增大；高度先增大后减小，重力势能先增大后减小．不考虑空气阻力时，机械能守恒，机械能保持不变．据此可以提出（不唯一）：问题①I work as a volunteer（志愿者）for an organization that helps the poor in Haiti. Recently I took my son Barrett there for a week, hoping to 36 him. Before setting out, I told Barrett this trip would be tiring and 37. For the first two days, he said almost nothing. I worried the trip was too 38 for a 17-year-old. Then, on Day three, as we were 39 over high rocky mountains, he turned to me and grinned（咧嘴笑）, “Pretty hard. ”After that there was no turning back. A five-year-old girl, wearing a dress several sizes 40 large and broken shoes, followed Barrett around, mesmerized （着迷）. He couldn’t stop 41 . Later he said 42. “I wish I could speak French.” I was 43－this from a boy who hated and 44 French classes throughout school. Usually silent, he 45 Gaby, our host, and kept asking questions about the country and its people. He blossomed（活泼起来）. 46 , the moment that really took 47 breath away occurred in a village deep in the mountains. I was 48 a woman villager for an article. 135 centimeters tall, she was small in figure but strong in 49 . Through determination, she had learned to read and write, and 50 to become part of the leadership of the 51 . Learning her story, Barrett was as 52 as I by this tiny woman’s achievements. His eyes were wet and there was a 53 of love and respect on his face. He had finally understood the importance of my work. When leaving for home, Barrett even offered to stay 54 as a volunteer. My insides suddenly felt struck. This 55 achieved all I’d expected. Soon he will celebrate his 18th birthday. He’ll be a man.小题1:A．comfort B．pleaseC．attract D．educate小题2:A．rough B．dangerous C．troublesome D．violent小题3:A．little B．much C．fast D．slow小题4:A．moving B．running C．climbing D．looking小题5:A．too B．very C．even D．so小题6:A．joking B．crying C．shouting D．smiling小题7:A．patiently B．regretfully C．lightly D．cheerfully小题8:A．ashamed B．disappointed C．determined D．surprised小题9:A．took up B．went in for C．fought against D．called off小题10:A．befriended B．disregarded C．avoided D．recognized小题11:A．Thus B．Even C．Meanwhile D．However小题12:A．my B．his C．our D．her小题13:A．asking B．interviewing C．arranging D．describing小题14:A．brain B．wish C．will D．health小题15:A．appeared B．struggled C．hesitated D．failed小题16:A．village B．city C．organization D．state小题17:A．pleased B．bored C．puzzled D．touched小题18:A．combination B．composition C．connection D．satisfaction小题19:A．in B．behind C．out D．away小题20:A．interview B．flight C．article D．trip