题目

耐心做一做，不写作法，保留作图痕迹.如图，已知线段a和b，且a＞b，用直尺和圆规作一条线段AB，使AB=2a＋b. 答案：解：以A为圆心，a为半径画弧交射线于点C，以点C为圆心，a为半径画弧交射线于点D，以D为圆心，b为半径画弧与交射线于B点，线段AB即为所求.阅读下面短文，掌握其大意，然后从方框中选出能填入文中空白处的最合适的单词，并将该单词的标号(A、B、C、D、E…)填写在文章下面对应题号的横线上。注意：方框中有多余的单词。 A. began   B.after   C. picked   D.heard  E.only   F.if G.and H.carry    I.first.   J.countries  K. held   L. before M. listened Maybe the word "hello" is used more often than any other one in the English language. Every one in the United States and other  1.  uses the word, again  2.  again, every day of the week. The American inventor Thomas Edison is believed to be the   3.    person to use "hello" on the telephone soon   4.  the invention of it. At first, people  5.  their words on the telephone with "Are you there?" They were not sure the small machine could really  6.  voices. Edison was a man of few words. He wasted no time. The first time he   7.  up the telephone, he did not ask  8.   anyone was there. He was sure someone was there and   9.   said "hello". From then on, "hello" is often   10.   when you picked up the telephone.