问题
单项选择题 A1/A2型题
下列生物碱中,不易与大多数生物碱沉淀试剂反应生成沉淀的是()
A.烟碱
B.秋水仙碱
C.麻黄碱和伪麻黄碱
D.莨菪碱和东莨菪碱
E.苦参碱和氧化苦参碱
答案
参考答案:C
下列生物碱中,不易与大多数生物碱沉淀试剂反应生成沉淀的是()
A.烟碱
B.秋水仙碱
C.麻黄碱和伪麻黄碱
D.莨菪碱和东莨菪碱
E.苦参碱和氧化苦参碱
参考答案:C
根据短文内容,并用正确形式或正确时态填空完成短文。 | |
I visited our zoo yesterday and I was very surprised to find hardly anyone there. Zoos are very important places they are like living textbooks for young people. They __1__ homes for many endangered animals and help to educate the public about __2__ for them. If we __3__ our zoos, they won't have enough money __4__ care of so many fine animals. I urge all of your readers __5__ our wonderful zoo soon. sincerely, Animal Friend |