器官功能发育不等速，是与其功能需要相适应的，小儿发育最早的器官是
A．心
B．脑
C．肺
D．肝
E．肾
参考答案：B
She brought with her three friends, none of__________ I had ever met before.
A．them
B．who
C．whom
D．these
从内容上看，一份好的问卷调查表至少应该满足哪几方面的要求?
