下列化合物中Molish反应呈阳性的是（） A.葡萄糖 B.槲皮素 C.芦丁 D.伞_爱下问搜题

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问题多项选择题

下列化合物中Molish反应呈阳性的是（）

A.葡萄糖

B.槲皮素

C.芦丁

D.伞形花内酯

E.甘草酸

答案

参考答案：A, C, E

解析：本题考查糖和苷的鉴别反应。Molish反应是用来鉴别糖和苷的反应，单糖和苷均呈阳性反应。答案A为单糖；答案C芦丁为槲皮素与芸香糖所成的苷，也呈阳性反应；答案E甘草酸为甘草次酸和2分子葡萄糖醛酸所成的三萜皂苷，也呈阳性反应。答案B、D均为苷元，为阴性反应。故正确答案为ACE。

多项选择题

下列哪些企业必须填报《重点税源工业企业主要产品与税收信息（月报）表》（）

A.煤炭

B.钢铁

C.汽车

D.农药

E.水泥

完形填空

Michel is a young girl who works for the police 21  a handwriting expert. She has helped   22 many criminals by using her special talents　　When she was fourteen, Michel was already 23  interested in the differences in her friends'   24 that she would spend hours 25  them. After 26  college she went to France for a 27  two-year class in handwriting at the School of Police Science.
Michel says that it is 28  for people to hide their handwriting. She can discover 29  of what she needs to know simply   30 looking at the writing with her own eyes,  31  she also has machines  32   help her make   33   different kinds of paper and ink. This knowledge is often   34  great help to the police.
Michel believes that handwriting is a good   35  of what kind of person the    36   is. "I wouldn't go out with a fellow    37  I didn't like his handwriting.” She says. But she  38 she fell in love with her future husband, a young policeman 39   she studied his handwriting. It is later proved to be   40 , however.

A．search　　

A．too 　　　

B．quite 　　

A．handwriting

B．books　　

B．writing 　

C．settling 　

B．starting 　

C．stepping into

A．powerful 　　

C．natural 　　　　

C．safe 　　

A．with 　　　

A．so 　　　　

A．they 　　　

C．in which 　　

A．to　　　　

A．thief 　　　

C．criminal　　

B．whether 　

C．unless 　　　　

B．repeats 　

A．after 　　

B．important 　