单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Members have a narrow range of topics to discuss.
B．Members bring up the most important issue.
C．Members have interesting topics to discuss.
D．Members have little knowledge.
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单项选择题
A scientist being interested in adding to our general knowledge about oxygen would probably call his approach ______.
A．applied science
B．environmental science,
C．pure science
D．agricultural science
填空题
before--after
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