计算。1+2=3+1=2+2=2+3=1+4=1+1=_爱下问搜题

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问题口算题

计算。

1+2=	3+1=
2+2=	2+3=
1+4=	1+1=

答案

3；4；4；5；5；2

选择题

His father is a teacher and his mother is a teacher ______. .

A．as well

B．either

C．also

D．too

填空题

常用的黑箱测试有等价分类法、【1】、因果图法和错误推测法4种。