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【多选题】
常用的相转移催化剂有（ ）。A.
季铵盐类
B.
鎓盐类
C.
环状冠醚
D.
聚醚类
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【单选题】In such a changing, complex society formerly simple solutions to informational needs become complicated. Many of life's problems which were solved by asking family members, friends or colleagues are b...
A.
they have to learn new things consciously.
B.
they lack the confidence of securing reliable and trustworthy information.
C.
they have difficulty obtaining the needed information readily.
D.
they can hardly carry out casual communications with an extended family.
【单选题】In such a changing, complex society formerly simple solutions to informational needs become complicated. Many of life's problems which were solved by asking family members, friends or colleagues are b...
A.
the lack of stable communities
B.
the breakdown of informal information channels
C.
the increased mobility of families
D.
the growing number of people moving from place to place
【简答题】阅读理解。 London won the right to host the 2012 Summer Olympic s. The British capital will become the first city to host the Olympics three times. London is one of the world's greatest cities. There a...
【简答题】如果每个人都能为保护环境做出自己的贡献，这个世界将变得更加美好。 The world will become much more beautiful if everyone ________ a contribution to ________ the environment.
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