22. D. 人们习以为常了,所以很少想到它,选rarely, 经常想起、从不想起和只想起它都不合理。
21. C. 时区time zone, 是固定词组。
30. A. was proved B. has been proved C. was proving D. proved
[答案]
29. A. everywhere B. anywhere C. nowhere D. somewhere
28. A. state B. county C. world D. country
27. A. regularized B. organized C. corrected D. standardized
26. A. arrived B. raised C. happened D. arose
25. A. different B. wrong C. incorrect D. mistaken
24. A. however B. therefore C. meanwhile D. by contrast
23. A. made B. established C. arranged D. founded
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