10.設集合M={x|x=2m+1，m∈Z},N={x|x=3n-1,n∈Z}，則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°，則(1-tanA)(1-tanB)=

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

 A.-                         B.                             C.                                   D.-

8.的值為

7.已知平面α，β和直線l，m，使α∥β的一個充分條件是

 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.設AB是拋物線x²=4y上兩點，O為原點，若|OA|=|OB|，且△AOB的面積為16，則∠AOB=

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

5.正六棱柱ABCDEF-A₁B₁C₁D₁E₁F的底面邊長等于側棱長，則異 線E₁C與AE所成的角為A. arccos            B.arccos                 C.arccos            D.arccos

4.長為3的線段AB的端點A、B分別在x軸、y軸上移動，則點C的軌跡是

 A.線段                       B.圓                                   C.橢圓                         D.雙曲線

3.已知各項都為正數的等比數列{a_n}的公比不為1，則a_n+a_n+3與a_n+1+a_n+2的大小關系是

 A.不確定的，與公比有關                              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