— Can I have some fruits?
— . ( )
A:Yes, I can.
B:No, I cannot.
C:Sorry, you cannot.
(2015•临沂)计算:aa+2﹣4a2+2a=____
____ TV too ____is bad for your eyes.
小明用如图所示的装置探究“水沸腾规律”.实验中需用到的测量工具有 ____.小明得到水沸腾的规律是 ____
下列对实验现象的描述正确的是( )