新出现的、与空调有关的医院感染病原体是（）
A.粘质沙雷菌
B.聚团肠杆菌
C.洋葱假单胞杆菌
D.嗜肺军团菌
E.阴沟杆菌
参考答案：D
— Spacecraft "Discovery" has failed in the course of launch.
— ________? They have been preparing for the test. [ ]
A. How come
B. When
C. How
D. Why not
市场调节是一种( )调节。
A．事前
B．事中
C．事后
D．以上都不是
