单项选择题

Questions 15 to 17 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.
Why does the professor mention the decline of the United States’ economy during the great depression

A．To discuss one way it impacted jazz music.
B．To explain why the government reduced some taxes.
C．To describe a common theme in jazz music.
D．To discuss the popularity of certain jazz bands.

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单项选择题

What is the killdeer’s nest in parking lot an example of

A．A primitive type of nest.
B．An elevated nest.
C．A typical cup-shaped nest.
D．A nest of twigs and branches.

单项选择题

According to the report, what has delayed the work of restoring power supply for Dakotas

A．Strong winds.
B．Ice.
C．Snow.
D．Low visibility.

Questions 15 to 17 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. Why does the professor mention the decline of the United States’ economy during the great depression

Questions 15 to 17 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.
Why does the professor mention the decline of the United States’ economy during the great depression