下列关于生物技术的安全性和伦理问题的分析，不合理的观点是（　　）

    Hi, I'm Tom. I'm a student. I'm eleven. My birthday is on 12th July. I go to school by bike. My father is a fireman. He uses water to put out fires. He's brave. He goes to work by bus. My mother is a doctor. She works in a hospital. She helps people. She goes to work by car. I like helping people, too. I want to be a doctor in the future. But my brother wants to fly a plane. He wants to be a pilot in the future.

纳米材料被誉为2l世纪最有前途的新型材料，纳米碳管是一种由碳原子构成的直径为几个纳米(符号nm，1nm=10^-9m)的空心管。下列说法中错误的是（）                                    

图中实线是一组不知方向的匀强电场的电场线，把2×10^﹣6C的负电荷从A点沿水平方向移到B点，电场力做了2×10^﹣6J的功．A、B两点间距离为2cm，问