已知条件：“”；条件：“，，”，则是的（   ）

—____did you go to Beijing?
—Yesterday.

请修改下面的短文。短文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除和修改。 增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。 删除：把多余的词用斜线（\）划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    Mr. Grey usually went to work by subway. He liked walking from a station to his office unless it was raining, because he could take some exercises. One morning he was walking along the street while a stranger stopped him and said to him, “You may not remember me, sir, but seven years before I came to London without a penny in my pockets. I stopped you in this street and asked you lend me some money, and you give me £5. You said you were willing to take a chance to give us a new start.” Mr. Grey felt a bit of surprised and thought for a few minutes. Then he said, “Yes, I remember you. Going on with your story.” “Well,” answered the stranger, “were you still willing to take a chance?”

科学家发现过度肥胖往往造成血糖浓度过高，而且血液中胰岛素浓度也偏高。某研究室对过度肥胖的老鼠进行实验，发现阿斯匹林（一种消炎止痛药）可矫正过度肥胖老鼠的生理缺陷。过度肥胖老鼠服用阿斯匹林三周后，注射胰岛素，120分钟内的血中葡萄糖相对值变化如右图所示，则下列叙述正确的是（对照组老鼠未服用阿斯匹林）
甲：阿斯匹林对老鼠的过度肥胖有治疗作用
乙：注射胰岛素使对照组及实验组的老鼠血糖在60分钟内明显下降
丙：对照组老鼠的细胞对胰岛素不敏感，使胰岛素不能有效发挥血糖调节作用
丁：服用阿斯匹林使老鼠细胞恢复对胰岛素的敏感性，使胰岛素得以降低血糖。

一节新干电池的电压为 ____　伏，供电时将 ____能转化为 ____能．