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鉴别小檗碱可用

A. 二硫化碳-碱性硫酸铜反应
B. 茚三酮反应
C. 漂白粉实验
D. 氯仿-浓硫酸反应

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What aspects should be included in describing a product?

A. size
B. color
C. shape
D. material
E. place

Which comparative is wrong?

A. soft,softer
B. big,biger
C. happy, happier
D. beautiful,more beautiful

What are included in a catalog?

A. colors
B. prices
C. models
D. sizes
E. styles

Which of the following are the sales promotion methods?

A. face to face
B. over the phone
C. online marketing
D. outdoor advertisements
E. price discount