多项选择题

If you had________ (听从了我的忠告，你就不会陷入麻烦).
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问答题
In order for space tourists to walk around and function normally, it is necessary for the space city to create a________.
单项选择题
The new National Science Education Standards are good news in that they will________.
A．provide depth to school science education
B．solve most of the problems in school teaching
C．be able to meet the demands of the community
D．quickly dominate U.S. educational practice
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