开瓶后的乙醚加入下列哪种试剂后能较长时间存放( )
A. 对苯二酚
B. 乙醇
C. 硫酸亚铁
D. 1，2，3-苯三酚
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According to the passage, bees are fitted for communal life by virtue of their （）
A. flexibility and initiative
B. intelligence and sensitivity
C. independence and endurance
D. instincts and form
The guides ______ the tourists together at the hotel gate.
A. accumulated
B. collected
C. assembled
D. resembled
70（）
A. up
B. from
C. for
D. on
NaOH应放置在( )器皿中。
A. 黑色塑料瓶
B. 白色玻璃瓶
C. 棕色玻璃瓶
D. 白色塑料瓶
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