What does the speaker suggest doing

A．People should get a reasonable amount of exercise regularly.

B．People should moderate the exercise they get.

C．People should be in good health before exercising.

D．It is important to have good health in this modem age.

当皮下组织的阻抗（R1）很小时，电流所通过阻抗最小的通路是（）。

A.神经系统

B.汗腺

C.皮肤

D.皮下组织

E.肌肉