A. use B. have used C. used D. are used——青夏教育精英家教网—

19. A. use B. have used C. used D. are used

18. A. kinds B. levels C. types D. tools

17. A. The B. Every C. Each D. One

16. A. it B. that C. what D. which

15. A. differences B. functions C. instructions D. experiences

14. A. to B. in C. inside D. from

13. A. with B. about C. against D. from

12. A. either B. alike C. such as D. among

11. A. processed B. discarded C. operated D. reflected

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