题目

阅读理解 I really love my job because I enjoy working with small children and like the challenges and awards from the job. I also think my work is important. There was a time when I thought I would never have that sort of career. I wasn't an excellent student because I didn't do much schoolwork. In my final term I started thinking what I might do and found I didn't have much to offer. I just accepted that I wasn't the type to have a career. I then found myself a job — looking after two little girls. It wasn't too bad at first. But the problems began when I agreed to live in so that I wou动脉血和静脉血比较，静脉血：①含氧多 ②废物多 ③含CO2多 ④在静脉中 ⑤颜色暗红 ⑥颜色鲜红A．①⑤ B．③④ C．①⑥ D．③⑤