题目

如图所示，在一固定水平放置的闭合导体圆环正上方，有一条形磁铁从静止开始下落，下落过程中始终保持竖直方向，起始高度为h，最后落在水平地面上。若不计空气阻力，重力加速度取g，下列说法中正确的是A. 磁铁下落的整个过程中，圆环中的感应电流方向始终为顺时针方向(俯视圆环)B. 磁铁落地时的速率一定等于C. 磁铁在整个下落过程中，它的机械能不变D. 磁铁在整个下落过程中，圆环受到它的作用力总是竖直向下的She was only about five feet tall and probably never weighed more than 110 pounds. However, Miss Bessie was a(n) ______ presence in the classroom. From 1938 to 1942, when I attended Saint Bernard's High School, she taught me a lot ______ I realized.There was never a(n) ______ problem in Miss Bessie's classes. We didn't dare to trouble a woman who knew about the Battle of Hastings and could also play the piano and ______ Shakespeare and Milton.Miss Bessie knew that my family couldn't afford to buy a newspaper. She knew we didn't ______ own a radio. Still, she ______ me to look out for my ______ and find some ways to ______ what's going on in the world. ______ I became a delivery boy who delivered newspapers. I ______ made a dollar a week, but I got to read a newspaper every day.Miss Bessie noticed things that had nothing to do with schoolwork but were vital to a youngster's ______. Once a few classmates made fun of my ______ overcoat. As I was leaving school, Miss Bessie ______ me on the back of that old overcoat and said, “Carl, never worry about what you don't have. Just make the most of what you do have—a(n) ______.”Among the things that I didn't have was ______ in the little wooden house. But because of her ______, I spent many hours beside a kerosene lamp(煤油灯) reading Shakespeare's works. Miss Bessie introduced me ______ a wonderful world of poems and stories. She led me to ______that I could write poems as well as Shakespeare.So I read ______ Miss Bessie told me to, and tried to remember the things she insisted that I store. Years later, her encouragement finally led to that lovely day when Miss Bessie dropped me a note ______“I'm so proud to read your article in The Times.”1.A. amusing B. towering C. interesting D. exciting2.A. more than B. less than C. better than D. worse than3.A. academy B. homework C. race D. discipline4.A. make use of B. make fun of C. make sense of D. make light of5.A. even B. still C. ever D. yet6.A. allowed B. forced C. turned D. encouraged7.A. happiness B. future C. family D. mistake8.A. catch up with B. come up with C. keep up with D. put up with9.A. So B. And C. Because D. As10.A. always B. merely C. sometimes D. almost11.A. appearance B. health C. development D. performance12.A. colourful B. modern C. informal D. used13.A. patted B. hit C. struck D. pulled14.A. house B. overcoat C. radio D. brain15.A. money B. electricity C. water D. gas16.A. inspiration B. anger C. curiosity D. sponsorship17.A. to B. in C. of D. about18.A. imagine B. believe C. dream D. insist19.A. whenever B. wherever C. whichever D. whatever20.A. writing B. printing C. saying D. speaking