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For our middle school students, some courses are compulsory, while others are ________.
A.flexibleB.optionalC.impressiveD.significant
B
词义辨析。A. 灵活的;柔韧的 B. 可选择的;随意的 C.感人的            D. 有效地;有意义的。句意:对于我们中学生,有些课程是强制性的,然而其它的是可选择的。故选B。
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