单项选择题

Questions 14 to 16 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
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.
D．To describe the structure of bacteri
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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.
单项选择题
Which one of the following statements is true about the new university policies
A．They are forbidding professors from drinking alcohol.
B．They are allowing alcohol to be sold only in the campus pub.
C．They are forbidding students from drinking in the dorms.
D．They are introducing a large tax on campus alcohol.
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