—I want to win the first prize in the coming school English competition.
—________.
A:I bet you do
B:What's it about
C:Nice work
D:I'll see to that
先化简,再求值:x1-x+x2-6x+9x2-1÷x-3x+1,其中x=2sin30°﹣1.
选出下列句子中没有语病的一项 ( )