有可能使血液黏稠度增加的先天性心脏病是（）
A.房间隔缺损
B.室间隔缺损
C.动脉导管未闭
D.法洛四联征
E.肺动脉狭窄
参考答案：D
______ readers said they were going to learn a new language. [ ]
A. A little
B. Little
C. Few
D. A few
简述准时货运服务和快速货运服务的含义
