Read the carefully before you do the test.A. directionsB. explanationsC. situationsD. occ

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(答案→)A. directions
B. explanations
C. situations
D. occupations
解析：考察名词辨析，directions 指导，操作说明，指南 explanations解释 situation 情形  occupation职业
句意为在你做实验之前，一定要仔细阅读操作说明。