根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    Jimmy started painting when he was four years old. When he was six, he was already very good at it. He 1 many beautiful and interesting pictures, and people 2 a lot of money for them. They said, “This boy's going to be 3when he's a little older, and then we're going to 4  these pictures for a lot more money. Then we will get rich.”    

    Jimmy's pictures were 5 from other people's because he never painted on the whole piece of  6. He painted on half of it, and the other half was always 7.

  “That's very clever,” everyone said. “8 else does that!”

    One day somebody bought one of Jimmy's 9 and then said to him, “Please tell me this, Jimmy. Why do you paint on the 10half of your paper, but not on the top half?”

  “Because I'm small,” Jimmy said, “and my brushes don't reach very high.”

在“用天平和量筒测量矿泉水密度”实验中，小明的实验步骤如下：
（1）调好天平，测出空烧杯质量m1;
（2）在量筒中倒入适量矿泉水，读出矿泉水的体积V ;
（3）将量筒中矿泉水全部倒入烧杯中．测出矿泉水和烧杯总质量m2;
则矿泉水密度的表达式ρ矿泉水＝                                          
以上操作由于无法将矿泉水从量筒中倒尽，测出的矿泉水密度误差较大．经过思考，小明在仍用步骤（1）、（2）的基础上，只对步骤（3）进行了改进，提高了测量结果的准确性．改进后的步骤（3）分为两步，请你写出改进内容：
A．                                                             
B．                                                              

阅读文言文，回答相关问题。
                                                                                                           苏秦之楚
        苏秦①之楚，三日乃得见王乎。谈卒，辞而行。楚王曰：“寡人闻先生若闻古人，今先生乃不远千里而临寡人，曾②不肯留？愿闻其说”。对曰：“楚国之食贵于玉，薪贵于桂，谒者③难得见如贵鬼，王难得见如天帝。今令臣食玉炊桂，因④鬼见帝”。王曰：“先生就舍③，寡人闻命⑥矣”。【注】①苏秦：战国时著名策士②曾：竟然③谒者：古代掌管进见的人（国君的近臣）④ 因：依靠⑤ 就舍：回到馆舍⑥ 闻命：敬辞，指明白对方的意思 。                                                                                                                                                                                                       （选自《战国策》 ）