我国北方有一种生态农业模式，是在温室里把种植农作物和养殖动物结合起来，实现优势互补，收到了良好的经济效益．关于这种生态模式的说法中，不正确的是（　　）

在正点电荷Q产生的电场中。a、b两带电粒子以相等的初速度射入电场，实线为两粒子仅在电场力作用下的运动轨迹，虚线为等势线。则（  ）

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    Michelle, a famous lady, has found that more than 25％ students are too fat in her country. It is a very serious problem. So she starts a health program to deal with it. The health program is to reduce the amount of fat students today and in the future.

    The program will get families, schools, newspapers, magazines and TVs to join together and deal with the students' obesity. So that students will be at a healthier weight. The program includes: Food stores should sell healthier foods. Schools should serve healthier meals with less fat and should also offer gym classes.

The lady is trying to fight the students' obesity all over the country because it can cause illnesses and higher health cost. She wants the students to eat right, exercise more and control their weight. At the same time she has also set a good example by planting a vegetable garden. She hopes that the garden will encourage more people to plant one too.

     The health program is really helpful to the students today and in the future. As she says, we cannot always build the future for youth, but we can build our youth for the future.