According to the discussion, what reason does the man give for rejecting string theory？
A. There may have been errors in the mathematical calculations.
B. Strings have not been observed in a laboratory.
C. String theory does not prove the theory of everything.
D. The experiments were not performed correctly.
查看答案
The word its in the passage refers to
A. Catastrophism.
B. planet.
C. England.
D. theory.
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.
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
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