题干

如图所示,A是由导热材料制成的密闭容器,B是一耐化学腐蚀且易于传热的透明气囊.关闭K2,将各1mol NO2通过K1、K3分别充入A、B中,反应起始时A、B的体积相同均为a L.

①B中可通过____判断可逆反应2NO2⇌N2O4已经达到平衡.

②若平衡后在A容器中再充入0.5mol N2O4,则重新到达平衡后,平衡混合气中NO2的体积分数____(填“变大”“变小”或“不变”).

③若容器A中到达平衡所需时间t s,达到平衡后容器内压强为起始压强的0.8倍,则平均化学反应速率v(NO2)等于____

④若打开K2,平衡后B容器的体积缩至0.4a L,则打开K2之前,气球B体积为____ L.

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同类题4

阅读理解

    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.

同类题5

根据短文理解,选择正确答案。

    I was waiting for a phone call from my agent. He had left a message the night before, telling me that my show was to be cancelled. I called him several times, but each time his secretary told me that he was in a meeting and that he would call me later. So I waited and waited, but there was still no call. Three hours passing by, I became more and more impatient. I was certain that my agent didn't care about my work, and he didn't care about me. I was overcome with that thought. I started to shout at the phone, “Let me wait, will you? Who do you think you are?”

    At that time I didn't realize my wife was looking on. Without showing her surprise, she rushed in, seized the phone, tore off the wires, and shouted at the phone, “Yeah! Who do you think you are? Bad telephone! Bad telephone!” And she swept it into the wastebasket.

    I stood watching her, speechless. What on earth...?

    She stepped to the doorway and shouted at the rest of the house, “Now hear this! All objects in this room---if you do anything to upset my husband, out you go!”

    Then she turned to me, kissed me and said calmly, “Honey, you just have to learn how to take control.” With that, she left the room.

    After watching a crazy woman rushing in and out, shouting at everything in sight , I noticed that something in my mood (情绪) had changed. I was laughing. How could I have trouble with that phone? Her anties helped me realize I had been driven crazy by small things. Twenty minutes later my agent did call. I was able to listen to him and talk to him calmly.