一、选择题（本大题共6小题，每小题2分，共12分.在每小题给出的四个选项中，只有一项是符合题目要求的）

1.下列各组角中，终边相同的角是

A.与kπ+  (k∈Z)                                        B.kπ±与  (k∈Z)

C.(2k+1)π与(4k±1)π  (k∈Z)                             D.kπ+与2kπ±  (k∈Z)

2.若角、的终边关于y轴对称，则α、β的关系一定是（其中k∈Z）

A. +=π                                                               B. －=

C. －=（2k+1）π                                         D. +=(2k+1)π

3.若一圆弧长等于其所在圆的内接正三角形的边长，则其圆心角的弧度数为

A.                                                                      B.

C.                                                                     D.2

4.在半径为10 cm的圆中，的圆心角所对弧长为

A.π                                                                 B.π

C.π                                                                D.π

5.将分针拨快10分钟，则分针转过的弧度数是

A.                                                                      B.－

C.                                                                      D.－21世纪教育网

6.圆的半径是6 cm，则15°的圆心角与圆弧围成的扇形面积是

A. cm²                                                                                                                             B. cm²

C.πcm²                                                                                                                                  D.3π cm²