It can be concluded from the passage that the immune systems of animals______.A.can be alt

外语类 公共英语 已帮助 人

It can be concluded from the passage that the immune systems of animals______.

A.can be altered by electric shocks

B.can be weakened by conditioning

C.can be suppressed by drug injections

D.can be affected by frequent does of saccharin

热搜:mvb总线与can总线的关系