多项选择题

下面哪些是合法域名（）

A. ABC.COM

B. ABC.CN

C. ABC.COM.CN

D. ABC.NET

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单项选择题

Which statement is true according to the video?
A、You can make a self introduction as long as you like.
B、You can use one version of self introduction for various purposes.
C、You don't need to pratise before delivering your introduction.
D、You should introduce yourself with different langauge under formal or informal occasions.

市场竞争研究是对某个特定竞争对手的研究。

答案：错误