被称为“骑在羊背上的国家”是( )
A:蒙古
B:新西兰
C:阿根廷
D:澳大利亚
They got two free tickets to Canada; otherwise, they'd never have been able to ______ to go there.
按拼音写汉字
bí tì
tì tóu
yāo he
____
设z=1–i(i是虚数单位),则复数2z+i2的虚部是