沈阳市的地铁工程正在顺利进行.地铁的铁轨通常是由锰钢制成的,锰钢属于( )
A.金属材料
B.合成材料
C.复合材料
D.无机非金属材料
答案:A
He proved himself a true gentleman and the beauty of his________was seen at its best when he
worked with others. [ ]
A . advantage
B. appearance
C. qualification
D. character
井喷