题目

John _______ any money from his parents because he can earn money by himself.     A) needn’t to       B) doesn’t need to     C) doesn’t need      D) needn’t 答案：C12．如图所示的装置中，两支笔构成了一个杠杆，可以轻松地举起很重的书，小指离支点越远，所用的力越小．