假分数的倒数是真分数．______．
当分子分母相同时，它的倒数还是它本身，还是假分数；
故答案为×．
请你判断函数f(x)=3-x2+2x+3的单调区间，并求它的值域．
Kate was not sure_______.
A．that she would play the lead role
B．if she will win an Oscar
C．which gate to go
D．which gate she should go through
