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1. 下列各式中，正确的写法为（     ）                              A.       B.      C.      D.   2．下列每个选项中集合M与N表示同一集合的是（     ）   A.      B. C.  D.    3．设  ，则（     ）A. a<b<c      B. b<a<c    C . b<c<a       D. a<c<b4.设 ，则使  为偶函数且在（0，+ ）上单调递增的 值的个数为     （     ）                                                                                                                                                                                  Ａ.1          Ｂ.2           Ｃ.3        Ｄ.4