题目

51．The teachers are very enthusiastic and friendly and the classrooms are (令人惊讶的). Every room has a computer with a special screen, almost as big as a cinema screen. 52．Today we introduced ourselves to each other. We did this in groups. Some students were(困窘的) at first but everyone was very friendly and it was really nice. 53．My first impression of Mrs Li was that she was (紧张的) and shy. I think perhaps she was, as it was her first lesson with us. 54．For the first few hundred kilometers of the (旅程), the scenery was very colourful. There were fields 科学家们经过长期探索，发现能量转化是非常普遍的，在一定条件下，各种形式的能量是可以相互转化的。例如：摩擦生热是________ 能转化为__________能；水电站里的水轮机带动发电机发电是________能转化为_________能；植物吸收太阳光进行光合作用是_________能转化为__________能；燃料燃烧时发热是________能转化为_______能。