A:−1
B:1
C:−2
D:2
用所给出的词语造句。
①盼望:
②忽然:
— Look at my new shoes! They cost me 100 yuan.
— Really? My shoes are _______ than yours.
已知二次函数f(x)=2ax2﹣ax+1(a<0),若x1<x2,x1+x2=0,则f(x1)与f(x2)的大小关系为( )