莽草酸是一种合成治疗禽流感药物达菲的原料，鞣酸存在于苹果、生石榴等植物中。下列关于这两种有机化合物的说法正确的是（ ）
| A．鞣酸分子与莽草酸分子相比多了两个碳碳双键 |
| B．等物质的量的两种酸与足量金属钠反应产生氢气的量相同 |
| C．两种酸都能与溴水发生取代反应 |
| D．两种酸遇三氯化铁溶液都显色 |
相关试题
What I need is_____ book that contains ______ABC of oil painting.
| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
Jenny nearly missed the flight______ doing too much shopping.
| A．as a result of | B．on top of | C．in front of | D．in need of |
The CDs are on sale! Buy one and you get ______ completely free. 
| A． | other | B． | others | C． | one | D． | ones |
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
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