The passage implies that_____ is a great favorite of many Americans, men and women, old and young.
A. jogging/running
B. joining running clubs
C. reading books and magazines about running
D. going in for all kinds of sports
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"You have put a bug in his ear" means that you have____.
A. made him laugh
B. shown concern for him
C. made fun of him
D. given him some kind of warning
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
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