下列词语中没有错别字的一项是( )
A:冥思遐想 孤陋寡闻 尽态极妍 一反既往
B:迥乎不同 姗姗来迟 委屈求全 叱咤风云
C:获益匪浅 恪尽职守 不言而喻 文彩藻饰
D:更胜一筹 左右逢源 迫不急待 妇孺皆知
a-b =a+( )
—Congratulations. He did well playing football when he was very young. I hope he'll be the best player in our school.
我国的地形多种多样,以 为主( )