According to the talk, why do some epidemiologists observe two groups of people
A. To learn why some people get a disease and others do not
B. To compare different people’s attitudes toward work
C. To explain why some people take better care of themselves
D. To understand cultural differences in approaches to disease
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Why does the professor say this:
A. To state that the Greeks invented improvisation
B. To provide historical examples of improvisation
C. To compare improvisation with other musical methods
D. To argue that one form of improvisation is superior to others
Why does the man say this:
A. To move on to another question
B. To imply that they need more information
C. To state that he will speak first
D. To conclude the conversation
Listen again to part of the lecture. Then answer the question, What does the professor mean when he says this:
A. It had been a long time since the previous eruption of St. Helens.
B. The public suddenly lost interest in watching the eruptions.
C. Scientists took a few days off before continuing their work.
D. The small eruptions paused briefly just before the major eruption.
How does the professor develop the topic of improvisation
A. By analyzing improvisation in classical music
By giving the correct definition of improvisation
C. By discussing the history of improvisation
D. By demonstrating improvisation on the organ
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