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TEXT A I remember meeting him one evening with his pushcart. I had managed to sell all my papers and was coming home in the snow. It was that strange hour in downtown New York when the workers were pouring homeward in the twilight. I marched among thousands of tired men and women whom the factory whistles had unyoked. They flowed in rivers through the clothing factory districts, then down along the avenues to the East Side. I met my father near Cooper Union. I recognized him, a hunched, frozen figure in an old overcoat standing by a banana cart. He looked so lonely, the tears came to my eyes. Then he saw me, and his face lit with his sad, beautiful smile -Charlie Chaplin's smile. 'Arch, it's Mikey,' he said. 'So you have sold your papers! Come and eat a banana.' He offered me one. I refused it. I felt it crucial that my father sell his bananas, not give them away. He thought I was shy, and coaxed and joked with me, and made me eat the banana. It smelled of wet straw and snow. 'You haven't sold many bananas today, pop,' I said anxiously. He shrugged his shoulders. 'What can I do? No one seems to want them.' It was true. The work crowds pushed home morosely over the pavements. The rusty sky darkened over New York building, the tall street lamps were lit, innumerable trucks, street cars and elevated trains clattered by. Nobody and nothing in the great city stopped for my father's bananas. 'I ought to yell,' said my father dolefully. 'I ought to make a big noise like other peddlers, but it makes my throat sore. Anyway, I'm ashamed of yelling, it makes me feel like a fool. ' I had eaten one of his bananas. My sick conscience told me that I ought to pay for it somehow. I must remain here and help my father. 'I'll yell for you, pop,' I volunteered. 'Arch, no,' he said, 'go home; you have worked enough today. Just tell momma I'll be late.' But I yelled and yelled. My father, standing by, spoke occasional words of praise, and said I was a wonderful yeller. Nobody else paid attention. The workers drifted past us wearily, endlessly; a defeated army wrapped in dreams of home. Elevated trains crashed; the Cooper Union clock burned above us; the sky grew black, the wind poured, the slush burned through our shoes. There were thousands of strange, silent figures pouring over the sidewalks in snow. None of them stopped to buy bananas. I yelled and yelled, nobody listened. My father tried to stop me at last. 'Nu,' he said smiling to console me, 'that was wonderful yelling. Mikey. But it's plain we are unlucky today! Let's go home.' I was frantic, and almost in tears. I insisted on keeping up my desperate yells. But at last my father persuaded me to leave with him. 11. 'unyoked' in the first paragraph is closest in meaning to
A.
sent out
B.
released
C.
dispatched
D.
removed
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【单选题】关于温度对酶促反应速度的影响叙述正确的是
A.
是指达最大反应速度一半时的温度
B.
与反应时间无关
C.
温度对酶促反应速度的影响不仅包括升高温度使速度加快,也同时会使酶逐步变性
D.
是酶的特征常数
【单选题】温度对酶促反应速度的影响叙述正确的是( )
A.
60℃以后温度越高活性越大
B.
低温使酶活性受抑制,但温度升高也不能恢复酶的活性
C.
高温破坏酶活性,温度降低后恢复
D.
低温可降低酶活性
E.
酶活性大小与温度成正比关系
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【单选题】有关温度对酶促反应速度影响的叙述中正确的是
A.
温度升高,反应速度总是随之加快
B.
低温使多数酶变性从而降低酶反应速度
C.
最适温度对于所有的酶都相同
D.
最适温度不是酶的特征性常数,延长反应时间最适温度降低
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【单选题】温度对酶促反应速度影响的叙述,正确的是
A.
低温可使大多数酶发生变性而使酶活性降低
B.
温度升高反应速度加快,与一般催化剂完全相同
C.
最适温度是酶的特性常数,与反应进行的时间无关
D.
最适温度不是酶的特性常数,延长反应时间,其最适温度降低
E.
最适温度对于所有的酶均相同
【单选题】有关温度对酶促反应速度影响的叙述中正确的是
A.
温度升高反应速度总是随之加快
B.
温使多数酶变性从而降低酶反应速度
C.
最适温度对于所有酶都相同
D.
最适温度是酶的特征性常数,与反应的进行时间无关
E.
最适温度不是酶的特征性常数,延长反应时间最适温度降低
【判断题】在编制施工组织总设计和单位工程施工组织设计及分部分项工程施工技术方案作业指导书时,必须考虑最佳的工期进度。为了保证工期进度,应尽量考虑同一立体空间、同一时间作业的工序同时交叉作业。
A.
正确
B.
错误
【单选题】下列关于温度对酶促反应速度影响的叙述中正确的是
A.
酶活性大小与温度高低成正比
B.
40℃ 以后酶活性增强
C.
0℃ 时酶活性受抑制,加温后酶活性不能恢复
D.
高温时,酶活性破坏,降温后酶活性不能复原
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