如图，在平面直角坐标系xOy内，第1象限存在沿y轴负方向的匀强电场，第Ⅳ象限以ON为直径的半圆形区域内，存在垂直于坐标平面向外的匀强磁场，磁感应强度为B．一质量为m、电荷量为q的带正电的粒子，从y轴正半轴上y=h处的M点，以速度v₀垂直于y轴射入电场，经x轴上x=2h处的P点进入磁场，最后以速度v垂直于y轴射出磁场．不计粒子重力．求：

    To save time, many Americans buy foods which can be quickly made ready for the table. On holidays, families enjoy delicious meals. For example, on Thanksgiving Day, the fourth Thursday in November, family members get together for a turkey dinner with pumpkin pie(南瓜派).

    People can easily find fast food chains(连锁店),such as McDonalds' and KFC, in most of the big cities in the world.

    These years, many people have taken more and more care of their health while eating. They come to know eating too much meat will make them overweight. Many of them are also worried about food addictives(添加剂). Some of them may be harmful to the body.

“人”加一笔变成____。