你如何向别人介绍你的妈妈: A. This is my father. B. This is my mother.
eight - one =________ A.seven B.four
twelve ÷ six =________ A.three B.two
three × three =________ A.nine B.six
four + five =________ A.nineB.ten
eleven A.十B.十一C.十二