某原子x的相对原子质量为23，该原子的原子核内质子数比中子数少1个，则该原子核内质子数为 ____ ，中子数为____  ，核外电子数为 ____。

运速最快，运费最高，受一定天气条件限制的交通运输方式是（  ）

阅读下面材料, 从A、B、C、D四个选项中选出最佳选项。

    Jumping rope(绳子)is a sport any student can learn to do．You can jump alone or with a friend．You can also help turn a long rope for many others to jump over．If you jump alone, you will need a short rope which should be just long enough for you．

    A rope should be turned slowly．It must also be turned high enough to let you jump safely．Turning the rope safely needs careful timing．In rope jumping, timing means turning the rope slowly enough so that you can jump over it at the right time without its hitting your feet．

  You will notice that when you jump rope, you breathe(呼吸)faster and your face has a healthy colour．But, if you jump too many times at first, you will get too tired．You must learn when to stop for rest(休息)before you jump again．As you practice, you can increase the number(次数)of times you jump without resting．

注意：1.短文内容应包含所有要点并适当扩充；2.文中不能出现真实的人名、校名等相关信息；3.字数：110左右。开头已给出。

    Dear Mary,

    I'm Zhang Li. I'm happy to hear that your family will come to Wenzhou this summer holiday.                

    Looking forward to your reply.

Zhang Li