题目

—Oh! I came to school in such a hurry and forgot to bring any books with me. —Never mind. You can use ________. A. our                 B. her          C. mine       D. yours 答案：C（2008•朝阳区二模）小华想做一个边长是10cm的正六边形图案（如图），那么它的半径是（ ）A．5cmB．10cmC．5cmD．10cm