—Steve is good at writing short stories.

— So he is. But he writes _______ than us. So he can’t get good grades in writing.

A．most carefully

B．more carefully

C．less carefully

D．least carefully

校验仪表的回差时，有的人把输入值固定，读上下行程的两个相应输出值，也有的人把输出值固定，读上下行程的两个相应输入值，请问哪一种方法正确？