单词拼写：

小题1: He is very t________, please give him a cup of tea.

小题2:We walk with our f_____________.

小题3:Don’t think much of the r_____________ of the exam .

小题4:He is kind of unhealthy. He h_______________ ever exercises.

小题5:We usually brush our t_____________ every morning.

小明左手抓紧一一根圆木棍，然后用右手旋动木棍在左手中转动，则木棍与左手之间发生的摩擦说法正确的是[ ]

A．是滚动摩擦    

B．是滑动摩擦    

C．左手抓木棍的力越大，木棍越容易转动    

D．在术棍上涂上润滑油，两手用力大小不变，摩擦力大小也不变