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【简答题】

Listen to the following passage. Altogether the passage will be read to you four times. During the first reading, which will be done at normal speed, listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 seconds. The last reading will be done at normal speed again and during this time you should check your work. You will then be given 2 minutes to check through your work once more.Listen to the following passage. Altogether the passage will be read to you four times. During the first reading, which will be done at normal speed, listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 seconds. The last reading will be done at normal speed again and during this time you should check your work. You will then be given 2 minutes to check through your work once more.

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参考答案:
参考解析:
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刷刷题刷刷变学霸
举一反三

【单选题】碱性最大的是

A.
麻黄碱
B.
小檗碱
C.
汉防己甲素
D.
苦参碱
E.
莨菪碱

【单选题】槲皮素的结构是

A.
5,7,4’-三羟基黄酮
B.
5,7,3’,4’-四羟基黄酮
C.
3,5,7,4’-四羟基黄酮
D.
3,5,7,3,4’-五羟基黄酮
E.
3,5,7,3’,4’,5’-六羟基黄酮