哈林顿·埃莫森在效率问题研究方面，提出了提高效率的12条原则。()
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改变航道原理是指计划的进程不变，但实现的总目标可以因情况的变化随时改变。()
The following can be bought online EXCEPT______.
A. the paper products
B. the cleaning products
C. the cereals
D. the meats
Which of the following is INCORRECT about David Bach？
A. He is a psychologist.
B. He is a financial advisor.
C. He is a psychiatrist.
D. He is a best-selling author.
According to this news item, experts are concerned about the following aspects EXCEPT ______.
A. population growth.
B. food resources.
C. water pollution.
D. water resources.
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