问题
单项选择题 共用题干题
大黄是常用中药，为蓼科植物掌叶大黄、唐古特大黄或药用大黄的干燥根及根茎。主要苷类成分有蒽醌苷及双蒽酮苷；游离型蒽醌类主要有大黄酚、大黄素、大黄素甲醚等。
大黄对消化系统的作用有泻下、保肝利胆等作用。其泻下作用的主要成分为（）
A.大黄素
B.大黄素甲醚
C.番泻苷
D.大黄酚
E.大黄酸
答案
参考答案：C
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大黄是常用中药，为蓼科植物掌叶大黄、唐古特大黄或药用大黄的干燥根及根茎。主要苷类成分有蒽醌苷及双蒽酮苷；游离型蒽醌类主要有大黄酚、大黄素、大黄素甲醚等。
大黄对消化系统的作用有泻下、保肝利胆等作用。其泻下作用的主要成分为（）
A.大黄素
B.大黄素甲醚
C.番泻苷
D.大黄酚
E.大黄酸
参考答案：C
| 阅读理解。 | ||||||||||||||||||||||||
Here is the survey of what the students in Mr Huang's class want to be:
| ||||||||||||||||||||||||
| 1. There are ______ students in the class, and ______ of them want to be reporters | ||||||||||||||||||||||||
| A. 20; 9 B. 40; 8 C. 50; 5 D. 60; 3 | ||||||||||||||||||||||||
| 2. The _____ is the most popular with the students. | ||||||||||||||||||||||||
| A. policeman B. lawyer C. actor D. reporter | ||||||||||||||||||||||||
| 3. From this survey, we can know being a ______ isn't popular with the students. | ||||||||||||||||||||||||
| A. reporter B. policeman C. teacher D. beautician | ||||||||||||||||||||||||
| 4. Some students want to be lawyers because they like ______. | ||||||||||||||||||||||||
| A. helping people B. traveling around the world C. being famous D. facing challenges | ||||||||||||||||||||||||
| 5. The survey can show us ______. | ||||||||||||||||||||||||
| A. some students hope to be a useful (有用的) man B. most boys like to be policemen C. all the teachers love children D. every girl wants to be beautiful |