5%硫喷妥钠10ml加入5%葡萄糖注射液500ml中产生沉淀是由于：A．pH

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问题单项选择题

5%硫喷妥钠10ml加入5%葡萄糖注射液500ml中产生沉淀是由于：

A．pH值的改变

B．直接反应

C．溶媒组成的改变

D．电解质的盐析作用

E．聚合反应

答案

参考答案：A

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How to become a better student

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阅读下面短文，掌握其大意，从各题所给的A、B、C、D四个选项中，选出最佳选项。
My wife was shouting at Sindu again．I threw the paper away and rushed to the scene．Mydaughter Sindu looked 36__．Her eyes were wet with tears．In front of her was a bowl 37___with bitter melon．Sindu particularly hated bitter melon, but my wife believed      38__ in the “cooling effects" of bitter melon. I tried to 39__ Sindu to take a fewmouthfuls．She   40__ down a bit and wiped her tears．Then she said she would eat the 41__bowl of bitter melon on condition that I gave her whatever she asked for．I agreed．Slowly and 42__ , she finished the whole bowl．After that, Sindu came to me with her eyeswide with 43__. To our surprise, she wanted to have her head   44__. "Impossible!"shouted my wife．However, I knew that if I   45__ on my promise, Sindu would neverlearn to  46  her own．So I decided to keep my promise．
On Monday morning, I 47__ her off at school．Just then，a boy shouted, "Sindu,wait for me!" What struck me was  48  hairless head．I was about to leave when a ladycame to me and said, "Sir, your   49__is great indeed!" I didn't 50__.She continued,“That boy is my son．He is   51__from Leukemia（白血病）．He lost all his hair_ 52__the side effects of the chemotherapy（化疗）• He   53__to come back to school because hewas afraid that the kids at school would make fun of him．Sindu visited him last week andpromised to help him, but I   54__imagined that she would sacrifice her lovely hair for thesake of my son! Sir, you and your wife are blessed to have such a（n） 55__ soul for achild．”
I didn't know what to say．It was then that I knew what love really was．
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