According to Paragraph 2, one reason why people chose to leave their homes in the Northeast was the fact that
A. factories did not pay workers enough money.
B. their families had moved to the Far West around 1840.
C. large cities were suffering from environmental degradation.
D. western settlements exhibited a culture similar to that in the Northeast.
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Why does the professor think that the acronym S.A.D.is unsuitable？
A. She did not participate in creating the acronym.
B. It does not reflect the seriousness of the problem.
C. Some of her patients object to the acronym.
D. The acronym is not an abbreviation for the words.
What is this lecture mainly about？
A. Symmetry in the visual arts
B. The characteristics of patterns
C. How the brain organizes information
D. A definition of beauty
What are the students discussing？
A. The T.A.in their class
B. The woman's presentation
C. PowerPoint handouts
D. The woman's class
How does the professor explain the closed string？
A. He refers the students to a web site.
B. He rewords the definition in the book.
C. He compares it with a thin rubber band.
D. He contrasts it with an open string.
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