题目内容

下列哪种化合物属于简单香豆素类

A. 芦荟苷
B. 大黄素
C. 七叶内酯和七叶苷
D. 补骨脂素
E. 花椒内酯

查看答案
更多问题

Kelly is putting the final ______ to her speech.

A. notes
B. remarks
C. comments
D. touches

My sister is always building castles in the air. The underlined part means ______.

A. daydreaming
B. using imagination
C. creating a work of art
D. bragging about herself

M0lish反应的试剂组成是

A. 苯酚硫酸
B. 萘-硫酸
C. α-萘酚-浓硫酸
D. 酚-硫酸
E. β-萘酚-硫酸

People who don"t regularly drink caffeine tend to be more ______ to its negative effects.

A. sensible
B. sensational
C. sentimental
D. sensitive

答案查题题库