下列运算正确的是( ).
A:﹣(﹣a+b)=a+b
B:3a3﹣3a2=a
C:(x6)2=x8
D:1÷ ﹣1=
写反义词。
聚精会神—____ 进步—____ 高明—____ 满意—____
— Rosa , can I wear jeans and a T-shirt to the evening party ?
— OK. But a dress might be _________