—My mother is nice to all her students. And she gets on well with all her friends.
A:What's your mother?
B:What's your mother like?
C:What does your mother look like?
D:What does your mother like?
在较暗的屋子里,把一枝点燃的蜡烛放在一块半透明的塑料薄膜前面,在它们之间放一块钻有小孔的纸板.由于____,塑料薄膜上就出现烛焰的____的像(如图)。这种现象叫小孔成像。
关于机械运动的说法中,正确的是( )
诗人柳宗元借寒江独钓的渔翁抒发了怎样的心情?