单项选择题
A.gaining a lot of experience B.making a lot of money C.having a lot of trouble D.learning a lot of knowledge
A. change his energy cycle C. get up earlier than usual B. overcome his laziness D. go to bed earlier
A.illustrate the ways to repair his bicycle B.discuss the problems of this bicycle C.tell us how to solve a problem D.show us how simple it is to repair a bicycle