据WHO统计,哪种疾病已成为全球0~14岁儿童的首位死因()。
A.伤害
B.传染病
C.先天异常
D.恶性肿瘤
E.消化道感染
参考答案:A
He made himself ___ in spite of his ___ English.
A.understand, broken
B.understand, breaking
C.understood , broken
D.understood, breaking
一下列哪类操作系统的源代码公开的
A.Windows
B.Unix
C.Linux
D.OS/2