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【简答题】
根据所听内容选择正确答案。 ( ) 1. A. She goes there on foot. B. He goes there on foot. C. He goes there late. ( ) 2. A. It's very cheap. B. It isn't expensive. C. It costs 10 yuan. ( ) 3. A. Yes, you can. B. Yes, I can. C. I want a pair of shoes. ( ) 4. A. I'm looking for my keys. B. I'm watching TV. C. I'm looking at the blackboard. ( ) 5. A. Yes, they are. B. They are in the classroom. C. They aren't in the classroom.
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举一反三
【多选题】α-去氧糖的显色反应有
A.
keller-Kiliani 反应(K-K 反应),冰醋酸-三氯化铁-浓硫酸反应,醋酸层呈蓝色
B.
呫吨氢醇反应,(呫吨氢醇加冰醋酸+浓硫酸),红色
C.
过碘酸-对硝基苯胺反应,显黄色,喷5%氢氧化钠转化为绿色
D.
间二硝基苯反应(Raymond 反应)
E.
对二甲氨基苯甲醛反应,红色
【简答题】数值求积公式中的梯形公式的代数精度为
【单选题】How could Melissa Baily be of assistance?
A.
She could advise on the laser printer.
B.
She could contribute ideas to the Continental Project.
C.
She could work out the travel itinerary.
D.
She is familiar with the competitors.
【单选题】In the dark they could not see anything clear, but could ______.
A.
hear somebody mourn
B.
hear somebody mourning
C.
hear somebody mourned
D.
hear somebody, had been mourning
【多选题】α-去氧糖的显色反应有
A.
keller-Kiliani反应(K．K反应)，冰醋酸-三氯化铁-浓硫酸反应，醋酸层呈蓝色
B.
吨氢醇反应，(咕吨氢醇加冰醋酸+浓硫酸)，红色
C.
过碘酸-对硝基苯胺反应，显黄色，喷5%.氢氧化钠转化为绿色
D.
间二硝基苯反应(Raymond反应)
E.
对二甲氨基苯甲醛反应，红色
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