趁热打铁，
	文章来源: 392 于 2012-12-31 00:02:30

你自己或你家小孩试试这个， answer each question with 5 seconds and post your answers: Assume a=1, b=2, and so on, Q1 what is c? Q2 what is x? Q3 what is a+b ? Q4 what is b+y ? Q5 what is x+x ?