未知题型 听力原文：Q: what is the boy going to do?(11)A.To go to the school dining hall with the girl.B.To eat the sandwich his mother has made for him.C.To have lunch with the girl at the restaurant.D.To drink a glass of water only.

未知题型 下列哪一项不属于单向时间取向人的特征（）。

单项选择题 （　）适用于利用正截面法进行表面展开。