题目

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。Everyday life in Britain The weather is the most common topic in Britain. . Because in Britain the weather changes a lot. Wind, rain, sun, cloud, snow— they can all happen in Britain. At banks, cinemas, shops, bus stops you can always see people in queues. They stand and wait quietly, often for a long time. Each new person stands at the end of the queue—- sometimes in rain, wind or snow. They never complain and they will get quite upset when someone jumps the queue. Men如果函数满足：对于任意的x1，x2∈[0，1]，都有|f（x1）-f（x2）|≤1恒成立，则a的取值范围是（ ）A．B．C．D．