题目

直线bx＋ay=ab(a＜b＜0的倾斜角是 A.π－arctan                                            B.arctan(－)C.arctan(－)                                           D.π－arctan 答案：解析:∵直线bx＋ay=ab的斜率k=－＜0，设直线的倾斜角为α(＜α＜π，则    tanα=－.∴α=π－arctan.答案:A点评:本题涉及了直线的斜率、直线的倾斜角以及反三角函数的有关知识，是一道小综合题.用反三角函数表示直线的倾斜角时，要注意反三角函数的值域以及倾斜角的范围.38、根据短文的意思，填写动词的适当形式。 George Frederick Handel, a small boy of six，lived in Germany．He loved music most．But his father didn't let him       (play)any music．     Then one day he waited until he     (be)alone at home．Quickly he rail to his hiding place, and he and a friend carried a small piano into the house．He decided to put it in his hiding place．There no one     (can)see it．That night，when everyone else was asleep．he went to his hiding place．The moon         (shine)through a broken window．     He sat on a box and began to play the piano．At that moment he knew that he could only be happy by         (play)music．He played on and on，and he filled his house with his music．“George!”cried his father．“What       you        (do)?Stop now!”George stopped and said，“Father，I love music．It is my whole life．” “Now listen to me，my dear son．”Said Mr Handel，“I want you      (be)a rich man．You must leave music and become a doctor．“But George didn't do as his father said．He still loved music very much．Later a good teacher taught him well and           (help)him write his own music．George became famous when he was eleven years old．By the time he was forty，he        (write)more than twenty good pieces of music．Now his music      (play)all over the world． 评卷人 得分 七、书面表达 （每空？ 分，共？ 分）