在H2、H2O、Ca(OH)2、H2SO4四种物质中都含有[ ]
A．2个氢原子
B．氢元素
C．2个氢元素
D．1个氢分子
答案：B
The boy’s foolish question ______ his mother who was busy with housework and had no interest in talking.
A．intrigued
B．fascinated
C．irritated
D．stimulated
国际上对外贸易统计有两种记录制度，我国海关统计采用的是总贸易记录制。（）
