保险的()是指投保人交纳保险费，保险人据此建立保险基金，并对少数遭受保险损失的被保险人提供补偿或给付。

A.经济性

B.科学性

C.契约性

D.互助性

书面表达。

        Maria要与同学聚会,她给表弟Tommy写了一张留言条.请他帮忙做些事情.请根据图片提供的信息,完成下面留言条.

Dear Tommy,

      I'm going to a party today. I need your help. In the morning, would you mind ___________

________________________________________________________________________

      If you finish all these things, I will give you a big surprise.

                                                                                                                    Love,

                                                                                                                   Maria