问题详情

Through Dr. Charles Czeislers experiment, we know that

A．blind people cannot tell their brain when there was more light.

B．the level of melatonin does not change in blind people"s blood.

C．facing light, the level of melatonin in blind people will increase.

D．not all the blind people have sensibility to light.

请帮忙给出正确答案和分析，谢谢！