填空题


How long had business-centered electronic commerce developed

【参考答案】

Over two decades/Over twenty years
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The science of how living creatures reproduce is called ecology.
单项选择题
Which of the following may be a potential competitor against an online magazine dealer
A．Another online dealer who sells the same magazine.
B．A sales man who sells video CD and story books.
C．A company which sells clothes, food, appliances, etc.
D．An online company which provides computer repairing service.
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