一本小说的页码在印刷时一共用了2013个数字，在这本书页码中的数字7出现的次数有几次？

根据短文内容从下面方框的7个选项中选出5个还原到文中，使短文意思通顺，结构完整，并将其答案的序号填到相应位置。
Dear Zhang Wei,
   I'm in New York now.____ . My English teacher is good-looking. Everyone in our class likes her very much.
____ . They are Sara, Ben, Nick and Peter. Sara has long straight hair.____ Ben has short curly hair and he can speak French very well, because his mother is a Frenchwoman. Nick and Peter are twins (双胞胎). ____. They can sing well.
What about your school life?____ .
                                                                                                                                                             Yours,
                                                                                                                                                             He Bin

我国水旱灾害比较频繁的主要原因是  （   ）