The teacher told the students             at people in trouble. [ ]

A. not laugh

B. to laugh

C. don't laugh

D. not to laugh

仁的思想在先秦时期的进步意义主要是（）

A.满足新兴地主阶级的政治需要

B.抑制统治者的暴政

C.成为各国变法的理论依据

D.奠定“非攻”主张的思想基础