-- Alice, how do your parents like pop music?
-- _____ my dad ______ my mom likes it. But they both prefer Beijing Opera.
A:Eigher; or
B:Neither; nor
C:Not only; but also
D:Both; and
已知a,b满足方程组2a-b=2a+2b=5,则2a+b的值为____
判断对错.
半径相同的一个整圆的周长一定比半圆的周长长