The question "How do you feel？ " seems to be correct and suitable when asked of_____.
A. a friend who is ill
B. a person who has lost a close friend
C. a stranger who looks somewhat worried
D. a man who is working at his desk
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George Bernard Shaw's reply in this passage shows his____.
A. silliness
B. cleverness
C. carelessness
D. politeness
某弱酸HA的Ka=2．0 ×10-5，若需配制pH=5．00的缓冲溶液，与100 mL 1．00 mo1·L-1NaA相混合的1．00mol·HA 的体积约为()。
A. 200 Ml
B. 50 mL
C. 100 mL
D. 150 mL
用莫尔法(AgNO3滴定X-)测定样品中的Cl-，若样品中含有Fe3+、A13+等离子，应采用何种方法消除其干扰()。
A. 掩蔽法
B. 沉淀分离法
C. 分步沉淀法
D. 返滴定法
This passage can be entitled____.
A Silly Question
B. Don't Trouble a Busy Man
C. What Are Good Greetings
D. George Bernard Shaw's Reply
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