脓胸引流不畅的原因（） A.引流过晚 B.引流口位置不够低 C.引流管内径过

．Was it ______ Expo 2010 that made Shanghai the focus of the world then?

A．hosted

B．to be hosted

C．hosting

D．having hosted

- Do you think the Stars will beat the Bulls?

- Yes. They have better players, so I_______ them to win.

A．hope

B．prefer

C．expect

D．want

菌群交替症指的是( )

A．菌群失调
B．二重感染
C．寄居部位的改变
D．医院内的环境感染
E．宿主的局部或全身免疫功能下降

严重超偏载货车换装整理作业流程是如可规定的？

下列不属于民间故事特点的是？（）

A、群众性

B、类型化

C、蕴含生活智慧

D、个人创造