题目

 Please give me _______ about the train to Hong Kong.    A. a few informations                                   B. a little informations    C. a few information                                    D. a little information 答案：D  information是不可数名词，所以用a little修饰。如图所示，O为杠杆的支点，请作出力F1和F2的力臂L1和L2．