中碳钢淬火后形成（）组织。

A.铁素体

B.珠光体

C.渗碳体

D.马氏体

Some people hold that the more conservative the world becomes, ______ have old furniture, old houses and old paintings.

A. the smarter is to


B. the smarter it is to
C. is it the smarter so

D. is one to the smarter