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
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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.
如果在制作上表时，我国的人口数量是以当年年末的人口总数为标准的，那么1978年底，我国的人口数约为()
A. 10.78亿
B. 9.56亿
C. 8.06亿
D. 7.89亿
What does the professor mean by this statement:
A. Kay earned high grades in all of her management courses.
B. Kay set goals and achieved results, as managers do.
C. Kay acted independently without help from other people.
D. Kay knew how to manage her time and money wisely.
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