A:Do you think what she likes best
B:What do you think she likes best
C:What do you think does she like best
D:Do you think what does she like best
— How much is the ____?
— ____ yuan.
读图,判断句子对错,并修改:
What's this?It's a bird. ____
已知实数满足x2+1x2+x-1x=4,则x-1x的值是( ).