题目

Speaking of all the songs he has written, I think this is probably his ____ one. A.  better-known           B. well-known  C.  best-known           D. most-known 答案：现在已经可以用激光测量月球与地球之间的距离．如果从地球向月球发射一束激光信号，经月球反射后返回地球经过2.56s的时间，由此可知，月球与地球之间的距离是A.7.68×105mB.7.68×108mC.3.84×105mD.3.84×108m