一个路口的红绿灯，红灯的时间为30秒，黄灯的时间为5秒，绿灯的时间为40秒，当你到达路口时，不需要等待就可以过马路的概率为（   ）

给下列句子排序。

____他让一束阳光从窗户上的小孔射进来。

____于是他断定，明亮的太阳并不是单一的白色，而是由七种颜色组成的。

____1665年的一天，英国大科学家牛顿在一间暗室里做实验。

____牛顿又做了许多次试验，出现的都是这种情景。

____当光束从一块玻璃制的三棱镜上通过时，这束光折射在墙上，映出了一条美丽的七色光带，依次是红、橙、黄、绿、青、蓝、紫七种颜色，同天上的彩虹完全一样。

    We know music is very important. Do you notice music playing at any of those places when you go somewhere? Today most stores, stations, restaurants and other places play music. You might even hear music in an office or on a farm.

    Scientists believe that music influences the way people behave. They think that the sound of western classical music makes people feel richer. When a restaurant plays classical music, people spend more money on food and drinks. When the restaurant plays modern music, people spend less money. Without music, people spend even less.

    Scientists also believe that loud, fast music makes people eat faster. Some restaurants play fast music during their hours. This makes people eat faster and leave quickly. Restaurants can make more money in this way.

    Some scientists think that music makes you think and learn better. They say that music helps students to be more active. It is true that people learn better when they are relaxed. And listening to music can help you relax.

    The next time you hear music somewhere, be careful. It might influence the way you do things.