He is not strong.He can do exercise well.这句话哪错了?

题目

He is not strong.He can do exercise well.这句话哪错了?

答案

自相矛盾.意思是：他不强壮,他能很好地做体育练习.
应该是He is not strong,but he can do exercise well.
他不强壮,但他能很好的做体育练习.