A.Because their hearts have nothing to worry about.B.Because their heart and blood ves

外语类 职称英语 已帮助 人

A.Because their hearts have nothing to worry about.

B.Because their heart and blood vessel are strong enough.

C.Because their muscles are greatly weakened.

D.Because they have the best doctor to advise on individual exercise.

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗