题目内容

It can also be __________ ( 便利的) very to do your shopping from home, day or night.

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With “Click and Collect,” the customer can order online and his order is __________ (递送到) to a store in his neighbourhood.

It now seems clear that Internet shopping is not going to __________ (取代) traditional retailing.

能生成鞣红的最根本原因是（）

A. 鞣质与空气接触
B. 鞣质在水中久置
C. 鞣质在酸性条件下加热
D. 缩合鞣质的缩合性
E. 可水解鞣质的水解性

有关鞣质溶解性错误的是（）

A. 可溶于乙醇
B. 难溶于乙酸乙酯
C. 可溶于乙醚和乙醇（4︰1）的混合液
D. 可溶于水
E. 难溶于氯仿