题目

图1-2是函数f(x)=Asinωx(A＞0,ω＞0)一个周期的图象，则f(1)+f(2)+…+f(6)的值等于(    )                      图1-2A.             B.          C.         D. 答案：解析：由题意可知A=2，T=8，ω==，f(x)=2sinx.∴f(1)+f(2)+…+f(6)=2(sin+sin+…+sin)=.答案：A读一读，做一做，你的阅读能力在提高On Christmas Eve (平安夜), Simon usually has a party with his family in his house. They buy a Christmas tree and decorate(装饰)it with flowers, toys, lights and cards. After they finish, it looks very beautiful. Then they have a big Christmas dinner. There is turkey, hot drinks and much other Christmas food on the table. After dinner, they sit under the Christmas tree and sing songs happily. They all have a lot of fun.1.Where do they have the party?A. In Simon's home. B. At school. C. In a shop. D. In Simon's classroom2.You may see_________ in the Christmas tree.A. some pencils B. some money C. a teddy bear D. boys and girls3.The underline word 'light' probably means(指的是) ________ here.A. 光; B. 灯 C. 轻的 D. 浅色4.After they finish, it looks very beautiful. Here 'it' means__________.A. Simon's house B. the Christmas tree C. the flower D. the turkey5.What do they do under the Christmas tree?A. They have Christmas dinner. B. They look for presents.C. They play 'trick or treat'. D. They sing songs.