The old saying has been handed ______ for several generations by word of mouth, must be something ______ it.
A、over, to
B、down, on
C、over,on
D、down,to
【正确答案】：D
【题目解析】：本题考查词组hand down和介词too hand over交出，移交；hand down流传，把…传下去；根据前半句题意“这个古老的格言已经口头相传好几代了。”可排除A和C。to有“关于，对于”的意思，而on则表示“在上，关于”，一般用于an article on physics一篇关于物理学的论文，这里to更合适。答案为D。
