下列说法中正确的是 ( )
A．物质是由大量分子组成的，分子间可以有空隙，也可以没有空隙
B．固体不易被压缩，说明分子间只有斥力，没有引力
C．同种电荷相互排斥，异种电荷相互吸引
D．地球是宇宙的中心，太阳围绕地球做圆周运动
答案：C
A．物质是由大量分子组成的，分子间存在空隙，错误；B任何分子间都存在引力和斥力，二者同时存在，错误；C．同种电荷相互排斥，异种电荷相互吸引，正确；D．地球不是宇宙的中心，地球围绕太阳做圆周运动，错误。
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