题目

   The hospital I work in sits on a beautiful mountain. People often have to walk about 40 kilometres in order to see a     41    .This is why home-based care comes in. A doctor and several nurses travel out to    42     sick people. Before I go out, I often buy some    43      for the poor people we will meet as some of them might be hungry. I       44   buy a bag of sweets for the children every time I go out.     One day, I     45     at an orphanage(孤儿院).Inside I saw a beautiful little girl, Tanzile. I gave her a sweet from my ba关于地球公转的叙述，正确的是（　　）A.与地球自转方向相反B.其轨道为一正圆C.公转过程中时快时慢D.太阳居于轨道中心