我国1～19岁的首位死亡原因是（）
A.伤害
B.抑郁症
C.性传播疾病
D.物质滥用
E.神经性厌食
参考答案：A
Half a month passed and the boy ________ all his money, so he had to turn to his friends for help.
A．ran out
B． ran out of
C．ran across
D．ran away with
铸铁含碳量大于（）。
A.2.11%
B.1.5%
C.1.8%
