题目

x2－2x－2＝0；                答案：1）x1＝1+，x2＝1-                 单词辨音1.A. capital B. bathroom C. match D. happy2.A. nineteen B. knife C. community D. invite3.A. about B. house C. double D. thousand4.A. shower B. own C. how D. flower5.A. machine B. children C. teacher D. chair6.A. France B. flat C. lamp D. Canada7.A. engineer B. English C. something D. uncle8.A. center B. bedroom C. helpful D. below9.A. player B. say C. stay D. says10.A. thousand B. through C. without D. south