正确

错误

campus

course

valuable

regarded

pioneer

perceive

majority

break

entrolled

establish K. participate L. reduced M. worthless N. minority O. prospect After retiring from 30 years of teaching, Ethbell Pepper could easily have decided to sit back and relax and enjoy a peaceful retirement. But that kind of life is not for Ethbell Pepper. "I just wanted to do something different. If you are going to _1 i n life, do it. Don't just sit down and look out of the window," she says. At 68, she decided to become one of the 2 participators in a program at the university of California. The program offers 3 housing and classes to people over sixty. She 4 in a class called Human Relationships and Diverse Society. "I taught _5 students in my English and drama classes in high school for 20 years. But in this 6 , I found out a lot about other cultures I didn't know then. One of the most important lessons that I'm learning is to _7 , not to judge." Older s can add to the educational resources of university by bringing with them a lot of _8 experiences. Their presence on campus helps __ 9 some long beliefs of aging. Young students may have fears of growing older. But that kind of fear can be __1 0 _ as they see the older people can be active, healthy, and continue to contribute to society. The younger students may begin to see aging as a natural part of living.

估算每个活动，得出需要多少工作量

估算每个活动所需的人时数

按日历时间来了解每个活动将花费的时间

估算每个活动需要多少人来完成

正确

错误

升华法

分馏法

超临界萃取法

冷冻法

化学法