10.设集合M={x|x=2m+1，m∈Z},N={x|x=3n-1,n∈Z}，则M∩N=

 A.{x|x=6k+1,k∈Z}                                         B. {x|x=6k-1,k∈Z}

 C. {x|x=2k+3,k∈Z}                                        D. {x|x=3k-1,k∈Z}

9.在△ABC中，C=45°，则(1-tanA)(1-tanB)=

 A.1                                   B.-1                             C.2                              D.-2

 A.-                         B.                             C.                                   D.-

8.的值为

7.已知平面α，β和直线l，m，使α∥β的一个充分条件是

 A.l∥m，l∥α，m∥β                                        B. l⊥m，l∥α，m∥β

 C. l∥m，l⊥α，m⊥β                                        D. l⊥m，l∥α，m⊥β

6.设AB是抛物线x²=4y上两点，O为原点，若|OA|=|OB|，且△AOB的面积为16，则∠AOB=

  A.30°                                   B.45°                         C.60°                  D.90°

5.正六棱柱ABCDEF-A₁B₁C₁D₁E₁F的底面边长等于侧棱长，则异 线E₁C与AE所成的角为A. arccos            B.arccos                 C.arccos            D.arccos

4.长为3的线段AB的端点A、B分别在x轴、y轴上移动，则点C的轨迹是

 A.线段                       B.圆                                   C.椭圆                         D.双曲线

3.已知各项都为正数的等比数列{a_n}的公比不为1，则a_n+a_n+3与a_n+1+a_n+2的大小关系是

 A.不确定的，与公比有关                              B.a_n+a_n+3<a_n+1+a_n+2

 C.a_n+a_n+3=a_n+1+a_n+2                                        D.a_n+a_n+3>a_n+1+a_n+2

 A.-                         B.                           C.-2                             D.2