单项选择题

Questions 18 to 20 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 does the airplane example illustrate about the deep sea research

A．Why it is difficult to use aerial photographs in research.
B．Why oceanic research is so limited.
C．How oceanic research has helped land research.
D．How light is used to attract sea lif

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单项选择题

What kind of class went on the field trip

A．Biology.
B．Photography.
C．Swimming.
D．Paintin

单项选择题

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.

Questions 18 to 20 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 does the airplane example illustrate about the deep sea research

Questions 18 to 20 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 does the airplane example illustrate about the deep sea research