—________. The beaches there are very beautiful and we also enjoyed some fresh seafood.
A:Not badly
B:Very much
C:Very good
D:So well
①若a<b,则a2<b2;
②若a≥b>﹣1,则 a1+a ≥ b1+b ;
③若正整数m和n满足m<n,则 m(n−m) ≤ n2 ;
④若x>0,且x≠1,则lnx+ 11nx ≥2.
其中所有真命题的序号是____
有人认为:“只要不犯罪,有一般违法行为不要紧。”这种观点之所以是错误的,是因为()