题干
下列物态在形成过程中吸热且保持温度不变的是（ ）
A： 蜡烛流的“泪”
B： 炽热的铁水
C： 清晨的露珠
D： 寒冬的树挂
答案(点此获取答案解析）
B
It is noon now. The sun is high in the sky. It is very hot. Look at the tree. The shadow is short. 
It is evening now. The sun goes down in the west(西方). Look at the tree, the shadow is long again. 
It is night now. The moon is high in the sky. There are some stars in the sky too. 