问题
单项选择题
蔗糖经水解后，旋光性质发生变化，这种水解后的蔗糖称为（）
A.还原糖
B.转化糖
C.变旋糖
D.葡萄糖
E.果糖
答案
参考答案：B
解析：蔗糖具右旋光性，而反应生成的混合物则具有左旋光性，旋光度由右旋变为左旋的水解过程称为转化。故这类糖称转化糖。
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蔗糖经水解后，旋光性质发生变化，这种水解后的蔗糖称为（）
A.还原糖
B.转化糖
C.变旋糖
D.葡萄糖
E.果糖
参考答案：B
解析：蔗糖具右旋光性，而反应生成的混合物则具有左旋光性，旋光度由右旋变为左旋的水解过程称为转化。故这类糖称转化糖。
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| I can still remember when I met my best friend. She had just moved into the neighborhood and her grandmother brought her down to __1__ me. I hid behind my mother and she hid behind her grandmother, __2__ to look at each other. Soon we lost the __3__ and started playing with each other. In the 7th grade, I first lost touch with her. She was __4__ family problems and I deserted her to be with the __5__ people. None of my new friends liked her as much as I did because they knew she had __6__. However, every summer we __7__ always sit at each other's house, watch soap operas, and talk about all the boys we liked. It was last year when I noticed the problem. I guess I was __8__ devoted in high school to __9__ she needed someone there. Anyway, she made a new best friend and so did I. Then I didn't know why, __10__ she started cutting herself! She then was diagnosed (诊断) with clinical depression. At first, I was very __11__， but we still stayed in __12__. I wanted to be there with her since her new best friend basically __13__ her and people were calling her __14__. Yesterday she came to me and said, “I never knew what a best friend was __15__ you, the only person, would stop me cutting. I __16__ your help so much, and you didn't even know you were __17__ me.” We both cried. And I guess a kind of __18__ from my life so far is never to give up on your friends. Even if they aren't as cool as others, or people think they are crazy, they need __19__ there. If you desert them, you will only be __20__ yourself. | |||
| ( )1. A. follow ( )2. A. scared ( )3. A. temper ( )4. A. taking up ( )5. A. happier ( )6. A. problems ( )7. A. should ( )8. A. much ( )9. A. admit ( )10. A. but ( )11. A. calm ( )12. A. place ( )13. A. confused ( )14. A. crazy ( )15. A. unless ( )16. A. expect ( )17. A. urging ( )18. A. honour ( )19. A. someone ( )20. A. innocent | B. meet B. annoyed B. interest B. getting through B. cooler B. shortcomings B. could B. too B. accept B. for B. considerate B. touch B. bothered B. stubborn B. as B. influence B. blaming B. favour B. something B. successful | C. join C. worried C. confidence C. going through C. stronger C. partners C. would C. only C. consider C. or C. upset C. control C. reminded C. clumsy C. until C. appreciate C. helping C. pleasure C. anyone C. guilty | D. support D. delighted D. shyness D. making up D. cleverer D. disabilities D. might D. just D. realize D. so D. helpful D. mood D. deserted D. stupid D. that D. demand D. hurting D. lesson D. everything D. reliable |