可用来制铅笔芯的是 [ ]
A.铅
B.金刚石
C.石灰石
D.石墨
答案:D
林文前年买了8000元的国家建设债券,定期3年,到期后他取回本金和利息一共10284.8元.这种建设债券的年利率是多少?
Mr. Su _____ in Zhuyuan Middle School since 1998. He regards it his second home.
A.lives
B.lived
C.has lived
D.will live