5个男生站一排，每2个男生中间站 3个女生，女生比男生多几人?

“如果你有一个苹果，我有一个苹果，彼此交换，我们每个人仍只有一个苹果；如果你有一种思想，我有一种思想，彼此交换，我们每个人就有了两种思想。”萧伯纳的这句名言告诉我们（  ）

我国交流电的周期是____s，频率是50Hz，在一个周期里电流的方向变化____次．

先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的单词。使短文完整。所填单词必须在答题卡标有题号的横线上完整写出。
     Do you like listening to radio? For some people, listening to radio programs has become a part of their d____ lives. How did this start?
      Radio began as ship-to-ship and ship-to-land c____ . In the early 1900s, several people showed that radio could do more than that. Dr. Lee De Forest, is w____  known as the father of radio. He made the first p____  radio broadcast. As a fan of opera, De Forest wanted to s____  the musical entertainment into homes. His first try was on January 13,1910, from the Metropolitan Opera House (大都会歌剧院) in New York City. However, the signal was not good enough. Only a few listening stations and a____ in the harbor (港湾) area were able to hear this broadcast. Although there was a lot to do to improve, it s____ what radio could do.
    Look at the world around us. Radio broadcasts are e____ . Information now travels at the speed of l____ . Music, news, traffic reports and speeches from world leaders are all on the radio. Can you imagine a world w____ radio?

作文题：
       在我们的成长岁月中，会收到很多礼物。也许，它是一盒香甜的生日蛋糕、一个漂亮的洋娃娃、一辆电动小汽车或者一本心仪已久的书；也许，它只是一抹关切的眼神、一句温暖的祝福、一个有力的臂膀或者一副温暖的胸膛；也许，它来自于你的父母、师长、朋友甚至是陌生人；也许它并不总带给你欢笑，也会有苦涩。但都值得你珍惜！

       请以“礼物”为题写一篇记叙文，字数不少于500字，不得出现真实的校名、人名。