题目

 —Hi, what’s wrong with the girl from Japan?     —Oh, she feels lonely, she has ________friends in China. A. few                           B. a few                       C. little                         D. a little 答案：A11．若$cos（\frac{π}{6}-α）=m，（|m|≤1）$，则$sin（\frac{2π}{3}-α）$的值为（　　）A．-mB．$-\frac{m}{2}$C．$\frac{m}{2}$D．m