问题
选择题
函数f（x）=sinx+cosx的最小正周期是（ ）
|
答案
由题意得，f（x）=sinx+cosx=f（x）=
sin（x+2
），π 4
则函数的最小正周期是T=
=2π，2π 1
故选B．
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函数f（x）=sinx+cosx的最小正周期是（ ）
|
由题意得，f（x）=sinx+cosx=f（x）=
sin（x+2
），π 4
则函数的最小正周期是T=
=2π，2π 1
故选B．
| 完形填空。 |
| Rose and Martin are ① Canada. They are good friends. They ② fishing. They ③ dance. Rose likes Chinese very much. Martin likes Maths. They ④ school five or six days a week. They play games ⑤ Tuesday and Thursday. They stay ⑥ home on Saturday and Sunday. They have two Chinese friends. ⑦ names are Li Lei and Wang Lin. All of them are in ⑧ same class. They like their school. They ⑨ , "The Chinese people are very friendly. The food is nice, ⑩ ." |
（ ）①A. to | B. of | C. from | D. on |