单项选择题

· For questions 23-30, mark one letter A, B or C for the correct answer.
Which is right about banner ads

A. They are always very attractive.
B. They come in identical shapes and sizes.
C. They improve online brand awareness.

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单项选择题What is the main difference between online advertising and traditional advertising

· For questions 23-30, mark one letter A, B or C for the correct answer. Which is right about banner ads 您的浏览器不支持 audio 元素。