He often sat in a small pub drinking considerably more than .
A. was good for his health
B. his health was good
C. was in good health
D. his good health
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The dressing-table was bare, a pair of ivory hair brushes.
A. in addition to
B. except
C. except for
D. besides
Five minutes earlier, they could have caught the last No. 127 bus.
A. but
B. so
C. and
D. or
三萜皂苷元由多少个碳原子组成
A. 27个
B. 30个
C. 25个
D. 28个
E. 21个
为了从水溶液中萃取皂苷类化合物,常选用的溶剂是
A. 乙醚
B. 石油醚
C. 丙酮
D. 正丁醇
E. 乙醇