党的思想路线的实质和核心是( )
A．实事求是 B．理论联系实际C．一切从实际出发 D．在实践中检验真理和发展真理
参考答案：A
—It’s too hot . Would you mind my ____ the window?
—_______ . Do as you like, please!
A．open; Sorry
B．opening; Certainly not
C．opening; Sorry
D．open; Certainly not
如图所示，瓶中装少量的水，水上方有水蒸气，塞紧瓶塞，用打气筒向瓶内打气，当塞子从瓶口跳起时：
(1)观察到的现象是___________________________________________________________．
(2)产生的原因是瓶内空气推动活塞做功时_______________________________________．
(3)通过大量类似的实验表明：_________________________________________________．
