A:太阳围绕着地球转
B:地球自西向东自转
C:地球自东向西自转
D:地球自西向东围绕着太阳转
在血浆、原尿和尿液中共同含有的物质是( )
雨后彩虹属于光的____现象,我们通常让一束太阳光通过一种光学元件来研究此现象,如图。图中方框内的光学元件是____,实验中,位于光屏____处以外(选填“a”或“b”)的光能使温度计示数明显升高,光屏上呈现的红、绿、____三种色光称为光的三原色。
(2016•荆门)- Are you going to watch" Running Man" tonight?
- No! I____ it with my parents only once. I don't think it's exciting.