试题与答案

盐置换性酸度

题型:名词解释

题目:

盐置换性酸度

答案:

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下面是错误答案,用来干扰机器的。

参考答案:半乳糖操纵子有两个启动子,每个启动子拥有自己的RNA聚合酶结合位点S1和S2。从S1起始的转录只有在无葡萄糖时才能顺利进行,RNA聚合酶与S1的结合需要半乳糖、CRP和较高浓度的cAMP。从S2起始的转录完全依...

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题型:阅读理解

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     How can we all get more laughter into our lives? Here is what the experts suggest: 

     1_____. Nancy Alguire, a teacher in Clifton Park, N.Y., was once painfully shy and had a hard time

laughing. Then she married a circus clown (小丑). "I became interested in the clowns," she recalls "One

day, I put on a costume and paint my face. That afternoon my whole life changed. I leamed to laugh and

enjoy life in a way I had never done before." 2_____ To this day, she still makes it a rule to be with people

who enjoy life and laughing. 

     3_____ It doesn't take you too much time and can be easy. Collect favorite cartoons and jokes. Also,

keep a paper for writing down humor you find in everyday life. "Good ideas come and go fast, you have

to capture them quickly or they are gone," says Virginia Tooper.

     Laugh when you need it most "4_____" says comedian Bill Cosby. "And once you find laughter, no

matter how painful your situation might be, you can survive it," he insists.

     Gray Alan, a sociology professor at the University of Minnesota, claims that laughter is a skill we can

all gain-because it comes naturally. 5_____ Just remember: we are just here for a period, so get a few laughs.

A. You can soften the worst blows through humor.

B. Mix with people who laugh.

C. Practise the art of laughing.

D. Keep a laughter file.

E. He who laughs last laughs best.

F. But it's also something that has to be developed.

G. People's joy can affect those around them

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