下列生活中常见的变化，属于化学变化的是（ ）
A：冰雪融化
B：菜刀生锈
C：灯泡发光
D：黄瓜榨汁
①知识创新是对已有知识的扬弃 ②知识创新是已有知识积累的量变
③知识创新需要新思路、新方法 ④知识创新需要与旧知识彻底决裂
⑴Amy ____ A. climbed the Tianshan Mountains yesterday.
⑵Sam ____ B. went to Xinjiang last year.
⑶Lingling ____ C. visited the Tianchi Lake last week.
⑷Daming ____ D. rode a horse last year.
⑸Tom ____ E. went to Beijing last summer holiday.
