- Did you go to Li Lei's birthday party? - No, I ___________.
A:am not invited
B:don't invite him
C:wasn't invited
D:haven't invited
人人都有创造力,有的人(包括残疾人)有发明创造,有的人却没有什么发明创造,原因虽然很多,其中一个最关键的因素是( )
在探究硬币上是否有细菌的小实验中,将硬币在细菌培养基表面轻轻一按,这一做法在细菌一般培养方法中叫做( )
25×2.4=____12- 56 =____ 1.25× 23 ×0.8=____ 13-15 =____
34 ×4÷4× 34 =____2.4× 38 =____( 18 + 14 )×16=____12.01×9.98≈____