When Madam Cuirie did the science experiement again, she was more careful where she _____ a mistake.

A．made

B．has made

C．was making

D．had made

马克思主义哲学创立之后，开始出现了（）

A.唯物主义与唯心主义的对立

B.辩证法与形而上学的对立

C.唯物史观与唯心史观的对立

D.可知论与不可知论的对立