表2  出超（+），入超（—）；单位：百万元

①宪法是其他法律的立法基础

②宪法是普通法律的立法依据

③普通法律规定的内容在宪法里都可以找到

④其他法律不得与宪法的原则和精神相违背

     Mr. Jackson is a teacher of science in a middle school. His students like his classes because his classes are very interesting. They can learn a lot in his class. The students can make（制作）many things. His little son Val also likes making things. He makes lots of machines（机器）, such as a machine like a man. It can do the job that is dangerous（危险的）for people to do. He says, “I want to be a scientist.”
根据短文内容，选择正确答案。