一、重点短语go on vacation去度stay at home待在家里go to the mountains去爬山go to the beach去海滩visit museums 参观博物馆go to summer camp去参观夏令营quite a few相当多study
1.in/on在表示空间位置时，in表示在某个空间的范围以内，on表示在某一个物体的表面之上。例如：There is a bird in the tree. 树上有只鸟。There is a picture on the wall. 墙上有张图。2.
