学生由易到难进行学习活动，如先学习加减再学习乘除，这种学习属于（

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31699' and id < 2537624 and id<>'2537624' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31699' and id > 2537624 and id<>'2537624' order by id asc limit 5