肺通气是指 A．肺与血液之间的气体交换 B．外界环境与气道间的_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

肺通气是指

A．肺与血液之间的气体交换
B．外界环境与气道间的气体交换
C．肺与外界环境之间的气体交换
D．外界气体进入肺的过程
E．肺泡气排出外环境的过程

答案

参考答案：C

补全对话，情景问答

阅读下列对话，选择正确单词。

Word List: best, beautifully, hurts, too, loudly, either, softly, singer, know, hear

Li Ming: Do you like karaoke?
Liu Fang: Yes, I _________ a karaoke restaurant. Come on!
Li Ming: Look at the woman. She can sing high, but she sings too _________. I can't _________ her.
Liu Fang: I can't hear her _________.
Li Ming: The short man sings _________, but he is a bad _________.
Liu Fang: Oh! That _________ my ears.
Li Ming: The little girl sings _________.
Liu Fang: I think so, _________. She sings _________.

填空题

作为价值尺度，货币解决了在（）和（）之间进行价值比价比较的难题。