以下现象是自然界常见的物态变化，在其物态变化过程中吸热的是[ ]
A．冰的消融
B．霜的形成
C．雪的形成
D．露珠的形成
答案：A
— Have you got a ticket for the football match?
— No. the price was too _____. [ ]
A. high
B. expensive
C. great
D. dear
当量齿轮
