(四级)邮政通信具有公众通信性质，（）就应达到一定的深度和广度。
A、邮政业务水平
B、邮政专业水平
C、邮政产品质量
D、邮政服务水平
参考答案：D
_____ as the most excellent student in her university, as most classmates had expected, made her parents very happy.
A．Mary was chosen
B．Mary chosen
C．Mary being chosen
D．Mary’s being chosen
患儿男，生后2天，出生体重为2400g。因吸入性肺炎入院，入院时患儿呼吸急促，口唇稍发绀。即置于辐射保暖床上抢救。
该患儿吸氧的流量应选择每分钟为（）
A.1L
B.2L
C.3L
D.4L
E.5L
