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题目内容
（佳木斯大学语言治疗学）
Whatisthefunctionofoptionalactivities( )
·Backupsincasethelessongoestoofastandthereareafewminutesleft.
·Preparedforgoodstudents.
·Preparedforbadstudents.
·Backupsincasethelessongoestoofastandthereareafewminutesleft.
·Preparedforgoodstudents.
·Preparedforbadstudents.
参考答案
