For our middle school students, some courses are compulsory, while others are __
题型：不详难度：来源：
For our middle school students, some courses are compulsory, while others are ________.| A．flexible | B．optional | C．impressive | D．significant |
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答案
| B |
解析
| 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。 |
举一反三
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