has known the man well.
A:Not only you but also he
B:Neither he nor you
C:Both you and he
D:Either you or they
如图所示,杯子中装满水,现向杯中轻轻放入一个小木块,小木块漂浮在水面,则放入木块后( )
南半球的气压带基本呈带状分布,而北半球的气压带则断裂成块状,主要原因是( )