下列胸廓改变，提示肺气肿的是（）。
A.扁平胸
B.桶状胸
C.漏斗胸
D.鸡胸
E.不对称胸
参考答案：B
根据句意和音标提示以适当形式填写单词。
1. Excuse me, what's the ________ /prais/ of this alarm clock?
2. My brother always ________/b/ his teeth after meals.
3. He knows a lot about ________ /west/ culture.
4. Do you know what you said has great ________ /influs/ on me?
5. I wish to ________ /kri'et/ a wonderful cartoon character for the children
6. Many art ________ /tre/ will be on display in this exhibition.
在OSI七层参考模型中，建立在传输介质的基础之上，实现设备之间的物理接口的层次为( )
A．数据链路层
B．网络层
C．传输层
D．物理层
/ his teeth after meals. 
s/ on me? 
/ will be on display in this exhibition.