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II. 单项填空
21. To many teenagers the cellphone is not only _____useful tool but also ____ way to have fun and be cool.
A. the…the B. an…the C. a…a D.a… 不填
22. __________unexpected advice they have given us!
A. What B. what an C. How D. How an
23. Environmental experts are those who devote ______to______ nature and environment.
21. To many teenagers the cellphone is not only _____useful tool but also ____ way to have fun and be cool.
A. the…the B. an…the C. a…a D.a… 不填
22. __________unexpected advice they have given us!
A. What B. what an C. How D. How an
23. Environmental experts are those who devote ______to______ nature and environment.
