According to the professor, what is one advantage of a survey？
A. It is the least expensive method of research.
B. It does not have to be conducted face-to-face.
C. It provides more information than any other method.
D. It is the most enjoyable method for the researcher.
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Listen again to part of the discussion．Then answer the question. Why does the professor ask this:
A. He does not know whether May or Kay is a better manager.
B. He disagrees with what the man says about May and Kay.
C. He wants to invite either May or Kay as a guest speaker.
D. He wants a more satisfactory response from the class.
What is the lecture mainly about？
A. The role of ethylene in plant aging processes
B. The discovery of ethylene by fruit growers
C. Differences between ethylene and other hormones
D. How plant hormones influence growth
农村分布率最高的是()
A. 小学
B. 普通中学
C. 师范学校
D. 私立中学
Listen again to part of the lecture．Then answer the question. What does the professor imply about age norms？
Age norms for a 40-year-old are the same in every culture.
B. An adult's status may be determined by age norms.
C. It is young adults who define their society's age norms.
D. Psychologists cannot explain why age norms exist.
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