Why does the author mention the Louisiana Purchase in Paragraph 1？
A. To discuss how the territories of Ohio and Alabama were added to the nation.
B. To identify the start of Americans' western migration.
C. To explain why pioneers were able to travel to the Mississippi River.
D. To illustrate how America expanded after achieving independence.
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What can be inferred about the students？
A. They have not formed opinions about the theory.
B. They do not agree with the professor's point of view.
C. They have reached different conclusions about the theory.
D. They have changed their minds during the discussion.
Which of the following is an important reason the Haida people carve totem poles？
A. To frighten away spirits
B. To decorate the village
C. To recall traditional stories
D. To worship the animals
What does the professor mean when he says this:
A. This fact does not directly relate to the topic.
B. He expects the students to write down the definition.
C. He is expressing uncertainty about the information.
D. The professor should not be talking about this tradition.
In Paragraph 1, the author introduces the debate between Neptunism and Plutonism by
A. providing information about the backgrounds of both of the geologists involved.
B. describing how scientists studied the planet before the creation of geology.
C. explaining the differences in the formation of sedimentary, igneous, and metamorphic rocks.
D. contrasting modern geologic knowledge with that of previous centuries.
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