题目

   Ken was twelve years old and was very lazy. He didn’t want to go to school. He  41  to do as  42  work as possible. His father and mother are both doctors. They hoped that their son  43  a doctor, too. But one day Ken said  44  his mother, “When I finish school, I want to  45  a dustman(垃圾清洁工).”    “A dustman?” his mother asked. She was very  46  . “That’s not a good job. Why do you want to be a dustman?”    “  47  I’d only have to work one day a week,” Ken answered.     “Only one day a week?” his mother said, “what do you mean? 大型水电工程对环境的影响可能有 [　　] A．明显减少河流的年径流量 B．显著增加河流泥沙的下泄量 C．降低库区地下水位 D．改变径流量的季节分配