题目

 ____ that caused him to serve dinner an hour later than usual. A. It was we being late                                     B. It was our being late C. It was we were too late                                 D. It was because we were late 答案：B下列说法正确的是（ ）A．通过导线横截面的电荷量越多，电流越大B．通电时间越短，电流越大C．通过导线横截面的电荷量越小，电流越小D．在单位时间内，通过导体某一横截面的电荷量越多，电流越大