问题
单项选择题
亲水性游离生物碱一般是指（ ）
A．生物碱盐类
B．叔胺类生物碱
C．仲胺类生物碱
D．季铵类和某些含氮—氧化合物的生物碱
E．酰胺类生物碱
答案
参考答案：D
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亲水性游离生物碱一般是指（ ）
A．生物碱盐类
B．叔胺类生物碱
C．仲胺类生物碱
D．季铵类和某些含氮—氧化合物的生物碱
E．酰胺类生物碱
参考答案：D
Two brothers worked together on a farm. One was married and had a large 41 .The other had no wife yet. Although they lived in different houses, they shared everything they got from their farm. One day, the single brother said to himself, “It’s not 42 that we share all the rice. I’m 43 and I need less than my brother.” So, every night he took a bag of rice from his store-room and 44 across the field 45 their houses, putting it into his brother’s store-room. At the same time, the married brother thought, “It’s not fair to share all the rice. I’m married and I have my wife and children to 46 me when I am 47 . However, my brother has no one to take care of his 48 .” So, each night he also took a bag of rice and put it into his brother’s store-room. Several months passed by. They found 49 strange that their rice never became less. Then, one dark night the two brothers ran into each other. Slowly they began to understand what was happening. Their bags fell onto the ground and tears 50 their eyes at once.
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