题目

阅读表达 Friendship is a very important human relationship and everyone needs good friends. Good friendship has many benefits. It offers companionship, improves self-worth and promotes good health. There are times in our lives such as when we have recently moved into a new town, or changed our jobs or schools. Such changes often leaves us without a friend. Making new friends comes easy for some people. But for many of us the process is difficult and requires courage. Below are some helpful suggestions on how to make and keep friends. Associate with others The first step to making f14．在正方体ABCD-A1B1C1D1中，E为线段A1C1的中点，则异面直线DE与B1C所成角的大小是（　　）A．90°B．60°C．45°D．30°