问题详情

What can we infer from the passage？
A．We can"t detect radioactivity even with modern equipment.
B．Only radiation at very high levels can kill an animal or human being.
C．If a few cells are only damaged, healthy cells will take the place of dead ones.
D．Radiation is harmful no matter what level it is.请帮忙给出正确答案和分析，谢谢！