题目

阅读B部分内容，选出最佳答案。    In England people don’t usually talk too much .You can go on a bus ,or in a train ,and everyone sits looking out of the window .  Often they read .They read books and papers .But they don’t talk much.  When you meet English people, they often talk about one thing, the weather. So when you meet somebody in English, you can say, “Nice weather for the time of year!” “But it was a little cold yesterday, ”somebody may answer . “But it got a bit warmer later!” you can say.  Talk like this ,and the English will think ,how friendly yo过抛物线焦点F的直线与抛物线相交于A、B两点，若A、B两点在抛物线的准线上的射影分别为，则等于[　　] A．45°　　　B．60°　　　C．90°　　　D．120°