免疫对机体是
A．有利的B．有害的C．有利也有害D．有利无害E．正常条件下有利，异常条件下有害
参考答案：E
. Every man, woman and child ______ some history, enough at least, to survive in the world.
A．knows
B．know
C．is known
D．are known
深化政治体制改革必须坚持党的领导、人民当家作主、依法治国有机统一。
