题目

完形填空阅读下面短文，从A、B、C、D中选出一个能填入短文中相应空白处的最佳答案。 New York, London, Paris and other big cities are interesting places to live in. There are   1   interesting things to see and to do. You can go to  2   kinds of museum, see plays and movies. You can also do shopping to  3   things from all over the word.     But there are serious   4  in gig cities, too. The cost of living is   5   , and there are too many people in some places of the big cities. Every year many people come to the cities because they can  6如图，边长为5的正方形OABC的顶点O在坐标原点处，点A，C分别在x轴、y轴的正半轴上，点E是OA边上的点(不与点A重合)，EF⊥CE，且与正方形外角平分线AG交于点P.(1)求证：CE=EP.(2)若点E的坐标为(3，0)，在y轴上是否存在点M，使得四边形BMEP是平行四边形?若存在，求出点M的坐标；若不存在，说明理由.