以下是一位同学做“探究形变与弹力的关系”的实验.
The husband and wife have strange habits. He'd like to sleep with lamp _______ at night and his wife likes to sleep with the window _______.
筷子是我国特有的用餐工具,一般使用筷子的方法如图所示,则筷子是()
青藏地区之所以能成为一个独特的地区,是因为( )