题干

下图表示人体内的细胞与细胞外液和外界环境之间进行物质交换的过程示意图。下列叙述不正确的是(    )

A:①②③分别代表血浆、淋巴和组织液,三者共同构成人体内环境

B:当人体蛋白质长期供应不足时,①③等处的渗透压会降低

C:①中含有的成分有:血浆蛋白、抗体、神经递质、水、无机盐等

D:无氧呼吸产生并释放到①中的乳酸由缓冲物质中和,以维持内环境pH相对稳定

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答案(点此获取答案解析)

C

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    As I walked along the Edgware Road, I felt as though the world was closing in on me. All the sounds I take for granted, had gone. I had entered a world of silence. This unsettling experience occurred a few weeks ago when I agreed to go deaf for the day to support the work of the charity Hearing Dogs for Deaf People, for which I am an ambassador.

    When I managed to take a cab to the office of my manager, Gavin, I couldn't hear what the taxi driver was saying to me. Conversation was impossible. Then, when I reached the office, I had to ring the intercom five times as I couldn't hear a response.

    Everybody said I was shouting at them—I simply wasn't aware of how loudly I was speaking as I couldn't hear my own voice. Gavin kept telling me my phone was ringing, but I didn't realize. I was too busy trying to concentrate on reading his lips. And when he tried to tell me a code to put into my phone, I had to keep asking him to repeat it, more slowly. Eventually he lost his patience and snapped at me: “Just give me the phone!” I was shocked.

    People couldn't be bothered to repeat themselves, so they kept trying to do things for me that I was perfectly capable of doing myself. I felt I'd lost control.

    Being deaf for the day was extraordinarily tiring. I had to work so hard to “listen” with my eyes, get people's attention and use my other senses to make up for my lack of hearing. It was a huge, exhausting effort.

    Until that experience I didn't realize how much I took my own hearing for granted, or the sorts of emotions and experiences deaf people go through. If a deaf person asks you to repeat something, never think: “It doesn't matter.” It does matter.