下列是关于人体的呼吸方面的论述，其中错误的是（） A．鼻_爱下问搜题

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问题选择题

下列是关于人体的呼吸方面的论述，其中错误的是（　　）

A．鼻腔对吸入的气体能起温暖、湿润、清洁作用

B．气管壁的腺细胞能分泌抵抗细菌和病毒的物质

C．吃饭时大声说笑容易导致食物进入气管，引起剧烈咳嗽

D．人平静吸气时呼吸肌舒张，肺容积减小，肺内气压增大

答案

A、鼻腔内有鼻毛，可以阻挡空气中灰尘的进入，对空气有清洁作用；鼻黏膜分泌的黏液，可以湿润空气和粘住灰尘，对空气有清洁和湿润作用；鼻粘膜内分布着毛细血管，可以温暖空气．因此鼻腔对吸入的气体能起温暖、湿润、清洁作用．故不符合题意；

B、气管壁的腺细胞能分泌黏液，黏液中含有抵抗细菌和病毒的物质，对吸入的气体有清洁作用．故不符合题意；

C、咽是呼吸道和消化道共有的结构，吃饭时大声说笑，会使会厌软骨来不及盖上，容易导致食物进入气管，引起剧烈咳嗽．因此吃饭时不能大声谈笑．故不符合题意；

D、人在平静状态吸气时，呼吸肌收缩，胸廓扩张，肺也随着扩张，肺容积增大，肺内气压减小，外界气体入肺；呼气时，呼吸肌舒张，胸廓缩小，肺容积减小，肺内气压增大，气体出肺（到外界）．故符合题意．

故选：D．

单项选择题

某工程网络计划中，工作M的总时差为5天，自由时差为3天。在计划执行情况的检查中，发现只有工作M的实际进度拖后了4天，则关于工作M实际进度的说法，正确的是( )。

A．使总工期拖后1天，使后续工作最早开始时间拖后1天
B．不影响总工期，也不影响后续工作的正常进行
C．使总工期拖后1天，但不影响后续工作的正常进行
D．不影响总工期，但使后续工作最早开始时间拖后1天

完形填空

“Check it again, you need to be sure.”This culture rule may sound      , but it is one of the most powerful culture rules. I took a lot of things for granted. In fact, I used to      people who often check things, such as their car engine oil, the house security, even the children in the bedroom. I didn’t realize that        this rule would cost me dearly.
One day the owner of the supermarket I worked in asked me to make a(n)      to the investors(投资者) whom we wanted to become partners with. I was given a month to        it.
The day of the presentation arrived. I left home at 7 am with the intention of getting to the office        . On the way , my car climbed over a bunch of      rocks and I heard a loud noise. I stepped on the brake       and got out of the car to check what happened: I had a flat tire.
“Oh dear, please not now .” I quickly ran behind the car to       the spare tire, only to be        again :there was none. I began to think of the moments when my wife would       me to get one each time I drove the car out. But I was too        to listen to her.
It was already 8 am and it seemed like I had only one       left. I had to run to the supermarket. It should        me about 45 minutes to get there . I       the car and ran as fast as I could , hoping I would have the      to get there on time .
      it took me longer than I had expected. I arrived at the       twenty minutes late. I       to the guests for my lateness and did my best to give a good presentation. Finally, the supermarket         the deal, but I was suspended(停职) for two months without pay.

A．make fun of

B．pay attention to

C．catch up with

A．contribution

C．presentation

B．prepare for

C．arrange for

D．account for

D．independent

A．Deliberately

B．Unfortunately

D．Consequently