单项选择题

Questions 28 to 30 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions. Now, listen to the news.
According to the report, which of the following is true

A．The climate summit in Copenhagen was aimed to extend the Kyoto Protocol.
B．The climate summit in Copenhagen was aimed to reach a new climate change treaty.
C．Negotiators at the climate summit in Copenhagen reached a new climate change treaty.
D．People’s reactions after the meeting were optimisti
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单项选择题
What is the main purpose of the talk
A．To discuss how microbes affect plants.
B．To introduce the main categories of microbes.
C．To demonstrate the use of a microscope.
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单项选择题
Why does the man say this He’s an expert on the natural history of the region and has written several books on the topic.
A．To emphasize the professor’s qualifications.
B．To state a desire to read the professor’s books.
C．To predict that the seminar attendance will be high.
D．To imply that the seminar needs improvement.
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