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What happens when you add zero to a number? Why? Chapter 2Lesson 4

	1楼巨大八爪鱼 2013-5-18 00:03 add ... to ...
	2楼巨大八爪鱼 2013-5-18 00:04 Add 4 to 3, and you will get 7.
	3楼巨大八爪鱼 2013-5-18 00:05 add some apples into the box. and add the others onto the table.

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