题目

如图，在△ABC中，AB=2，BC=3.6，∠B=60°，将△ABC绕点A按顺时针旋转一定角度得到△ADE，当点B的对应点D恰好落在BC边上时，则CD的长为______． 答案：1.6 【分析】 由将△ABC绕点A按顺时针旋转一定角度得到△ADE，当点B的对应点D恰好落在BC边上，可得AD=AB，又由∠B=60°，可证得△ABD是等边三角形，继而可得BD=AB=2，则可求得答案． 【详解】 由旋转的性质可得：AD=AB， ∵∠B=60°， ∴△ABD是等边三角形， ∴BD=AB， ∵AB=2，BC=3.6， ∴CD=BC-BD=3.6-2=1.6． 故答案 第二节：完形填空（共20小题；每小题 1  分，满分  20 分）  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,D）中，选出最佳选项。     Once there was a group of men---- a young hot-blooded man and a big number of old folks, doing a timber(木料) job in a jungle. This young man was very -36-. He always continued to work through his break time and -37- that those old folks were wasting time, having to -38- several times a day to drink and chat. As time went by, this young man noticed that -39- he worked through break time and hardly took a -40-,those old folks were chopping the same -41- of trees as he did and sometimes did more. It was as if they worked through the break time as he did. So he -42- to work harder the next day. Unfortunately the -43- were even worse. One day, one of the old folks -44- him for a drink during their break time. That young man -45- and said that he had no -46- time! Then the old man smiled and said, “It is just a waste of effort to -47- chopping trees without re-sharpening your axe(斧子). Sooner or later you will -48- or be so tired as you have spent too much -49-.” Suddenly the young man -50- that actually during break times while those old folks were having a chat, they were -51- re-sharpening their axes at the same time! And that’s how they could -52-faster than him, yet spending less time! What we -53- is efficiency by making use of our skill and ability -54-. Only then can we have more time to do other things. Otherwise we will always keep saying…..I have no -55-! 36. A. weak        B. clever        C. hard-working    D. good-looking 37. A. admired      B. complained   C. reminded       D. predicted 38. A. plan         B. appear       C. work           D. break 39. A. even though   B. only if       C. because        D. unless 40. A. photo        B. rest         C. step            D. bath 41. A. weight       B. height       C. amount         D. price 42. A.failed        B. pretended     C. agreed          D. decided 43. A. marks       B. results        C. effects          D. conditions 44. A. invited      B. blamed        C. thanked        D. forgave 45. A. begged      B. argued        C. nodded         D. refused 46. A. wrong       B. valuable      C. extra           D. exact 47. A. mind        B. avoid        C. practice         D. keep 48. A. speed up     B. give up       C. watch out       D. turn out 49. A. energy      B. money        C. life            D. skill 50. A. warned     B. expected       C. realized        D. announced 51. A. also        B. hardly         C. seldom         D. never 52. A. talk        B. chop          C. walk           D. climb 53. A. abandon    B. introduce       C. need           D. teach 54. A. quickly     B. curiously       C. seriously        D. intelligently 55. A. time       B. tool            C. job            D. patience