_______ did they watch the 2012 London Oylmpic Games, _______ I watched it.
A:Either; or
B:Neither; nor
C:Both; and
D:Not only; but also
火星和木星沿各自的椭圆轨道绕太阳运行,根据开普勒行星运动定律可知( )
有关俄罗斯说法正确的是( )
下列说法错误的是( )