问题
单项选择题
在较高pH值的碱性溶液中易于消旋化的是()
A.吗啡
B.小檗碱
C.莨菪碱
D.麻黄碱
E.苦参碱
答案
参考答案:C
在较高pH值的碱性溶液中易于消旋化的是()
A.吗啡
B.小檗碱
C.莨菪碱
D.麻黄碱
E.苦参碱
参考答案:C
词形变换:选择方框里的词的正确形式填空,每词只用一次。(10分)
1. We ________ a science experiment in class tomorrow. 2. Do you know who ________ America? 3. They will show us a ________ experiment in class. 4. I have nothing ________ to my letter. 5. Air is ________ than we think. 6. The force is strong enough ________ the water. 7. I will ask the class to make ________ and guess what will happen. 8. An Easter egg hunt is a game for ________ eggs. 9. To make a candle ________, you “light” it. 10. When the candle stops burning, it ________ up all the oxygen in the air. |