1.The passage is mainly about ________. A) a new regulation for al airlines B) the defects of electronic devices C) a possible cause of aircraft crashes

1.The passage is mainly about ________.
A) a new regulation for al airlines
B) the defects of electronic devices
C) a possible cause of aircraft crashes

出自：河南师范大学-小学教育（本科)-大学英语Ⅱ

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