题目

计算：103+（）﹣2×（﹣600）0﹣（﹣3）3×0.1﹣1×π0   答案：原式=1000+900+270=2127；    ------ Ian gave up playing the piano eventually.    -------It’s just_____of him to spend all that money on the equipment and then lose interest halfway through the course.     A. normal     B. ordinary    C. common   D. typical