File:Challenge Apple.png

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Description	This picture illustrates questions of appropriate difficulties can challege students.
Source	my own
Date	2012-04-03
Author	Mengyuan Zhao(Zhaomeng (talk)Zhaomeng)
Permission (Reusing this file)	See below.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	20:48, 9 October 2012		2,769 × 819 (1.29 MB)	Zhaomeng (discuss \| contribs)	Image Summary {{Information \|Description=This picture illustrates questions of appropriate difficulties can challege students. \|Source=my own \|Date=2012-04-03 \|Author=Mengyuan Zhao(Zhaomeng (talk)Zhaomeng) \|Pe...

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