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问题 单项选择题

人体维生素B1缺乏时，红细胞转酮醇酶活力及TPP效应的变化应是()

A、转酮醇酶活力及TPP效应均降低

B、转酮醇酶活力及TPP效应均增高

C、转酮醇酶活力降低，TPP效应增高

D、转酮醇酶活力增高，TPP效应降低

答案

参考答案：C

阅读理解
阅读短文，根据短文内容，从短文后的五个选项中选出能填入空白处的最佳选项.选项中有一项为多余选项。

   If you ask a teacher in China what makes a good student, he or she would probably tell you that a
good student is someone who gets high marks in exams. It is true that most teachers share this opinion.
1_____She says that as an educator,she feels sorry about what her students have to do every day. She
hates to see her students study day and night for the endless exams.These teenagers have no time to
relax or hang around with their friends. rrhey shouldn't be turned into book-worms(书呆子).2______  
Shen Hong thinks a good student should be like this:    
    A good student is honest and kind to others. 3______If he does something wrong, he says sorry
immediately. A-part from this,a good student is always ready to help hisfriends when they are in trouble.      
    A good student is one who always tries his best instudies. He makes full use of his time to learn both
in andout of class. Hard work comes first no matter how cleverhe is. 4 ______   He often plays ball
games or goes campingwith his friends. In a word, he develops in an all-round way.

A. In other words, he never lies to his friends.
B. However, one teacher called Shen Hong has a different attitude.
C. And it's also not right to judge a student only by the marks.
D. But a goog student should work hard all the time.
E. Besides studying,he also likes outdoors sports.

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填空题

高级汽车中常配置一种汽车安全气囊，内部贮存有硝酸铵。当汽车高速行驶中受到猛烈撞击时，硝酸铵迅速分解出大量的一氧化二氮气体和另一种氧化物充满气囊，隔在乘员和挡风玻璃、方向盘之间，防止乘员受伤。

（1）写出硝酸铵受撞击时发生分解反应的化学方程式_______________________ ；

（2）从安全角度，在存放和使用化肥硝酸铵时要注意哪些问题？__________________
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