题目：
选择题
What does Tim Berners-Lee's description about Web 2.0 mean? __________
- A. Web 2.0 is an entirely new concept.
- B. Web 2.0 is not defined clearly.
- C. Web 2.0 is a very popular now.
- D. web 2.0 is an revolution in the World Wide Web
答案：
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