单项选择题

A．central
B．concentrating
C．focusing
D．centering
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单项选择题
Which of the following statements is NOT true according to the passage
A．Though a face-to-face meeting would cost much in travelling; it is more effective.
B．Many firms only deal impersonally with other firms in order to save money.
C．Good salesmen often bring notebooks along with them and note down the customers’ opinions.
D．Key accounts and prospects are important to all companies.
单项选择题
VCR has many advantages, but it also has its limits which lie in ______.
A．it’s not easy to duplicate prerecorded movies
B．it can not duplicate prerecorded movies
C．it can not be operated easily
D．it takes too long to duplicate prerecorded movies
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