题目

完形填空 Loneliness is a growing problem in the worldtoday. People are asking the question How can I deal with loneliness? There are many reasons why people are lonely. A (n) 1 ofsituation is one reason. For example, the death of a husband or wife causesextreme loneliness—2 forpeople who live with their children.Moving to a newplace to live can 3 cause loneliness. Many people have to move fora (n) 4. Theygo to universities in other countries. Theyare 5 their families and their culture. And this isa big 6 of loneliness. But maybe the worst reason to feel lonely isrejection (拒绝). For e一个物体做直线运动，初速度的大小是2m/s，末速度大小为4m/s，则（　　） A、速度变化量的大小可能是6m/sB、速度变化量的大小可能是4m/sC、速度变化量的方向可能与初速度的方向相同D、速度变化量的方向一定与初速度的方向相同