By saying that "some tips are certainly in order" (line 2), the author means that ______.
A. some advice for the trip is necessary
B. some small changes are useful
C. business experience is helpful
D. careful planning is a must
“最近发展区”概念是由前苏联心理学家（）提出的。
A. 鲁利亚
B. 维果斯基
C. 达维多夫
D. 列昂节夫
Why is lightweight luggage important for travelling businesswomen
A. It provides space for dirty clothes
B. It enables them to travel easily
C. It can also be used as a briefcase
D. It can be easily folded when packed
In the third paragraph, the phrase "put on stage" ( line 3, para. 3 ) means ______.
A. written down in a book
B. performed in a theatre
C. made a success
D. shown in a film
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