题干

洋蓟素是一种新结构类型的抗乙型肝炎病毒和抗艾滋病病毒的化合物, 其结构如下图所示,有关洋蓟素的说法正确的是(连四个不同基团的碳属于手性碳)

A:分子中含有6个手性碳原子

B:不能与氯化铁溶液发生显色反应

C:一定条件下能发生酯化反应和消去反应

D:1 mol洋蓟素最多可与11 mol NaOH反应

上一题 下一题 0.0难度 选择题 更新时间:2019-02-26 05:17:32

答案(点此获取答案解析)

C

同类题4

阅读理解

    Perhaps you think you could easily add to your happiness with more money. Strange as it may seem, if you're unsatisfied, the issue is not a lack of means to meet your desires but a lack of desires—not that you cannot satisfy your tastes but that you don't have enough tastes.

    Real riches consist of well-developed and hearty capacities (能力) to enjoy life. Most people are already swamped(淹没) with things. They eat, wear, go and talk too much.They live in too big a house with too many rooms, yet their house of life is a deserted hut.

    Your house of life ought to be a mansion (豪宅) , a royal palace.  Every new taste, every additional interest, every fresh enthusiasm adds a room.  Here are several rooms your house of life should have.

    Art should be a desire for you to develop simply because the world is full of beautiful things. If you only understood how to enjoy them and feed your spirit on them, they would make you as happy as to find plenty of ham and eggs when you're hungry.

    Literature, classic literature, is a beautiful, richly furnished room where you might find many an hour of rest and refreshment. To gain that love would go toward making you a rich person, for a rich person is not someone who has a library but who likes a library.

    Music like Mozart's and Bach's shouldn't be absent. Real riches are of the spirit. And when you've brought that spirit up to where classical music feeds it and makes you a little drunk, you have increased your thrills and bettered them. And life is a matter of thrills.

    Sports, without which you remain poor, mean a lot in life. No matter who you are, you would be more human, and your house of life would be better supported against the had days, if you could, and did, play a bit.

    Whatever rooms you might add to your house of life, the secret of enjoying life is to keep adding.