慢性特发性血小板减少性紫癜最常见于
A．婴幼儿B．青少年C．青年女性D．青年男性E．中年人
参考答案：C
There are many reasons why some children have bad manners, ______ is the ill information on the Internet and in TV programme．
A．one of them
B．it
C．one of which
D．that
我国的高新技术产业起步晚发展迅猛，影响高新技术产业布局的主导因素是
A．资源和能源
B．知识和技术
C．劳动力数量
D．交通运输
