抗肿瘤药物氟尿嘧啶5位氟原子与（）是电子等排体。
A.氟原子
B.碳原子
C.氢原子
D.氮原子
参考答案：C
Although I liked the appearance of the house, what really made me decide to buy it was the beautiful________ through the windows.
A．view
B．scene
C．sight
D．scenery
纳税人应当在向公安机关等车辆管理机构( )，缴纳车辆购置税。
A．办理车辆交强险手续时B．办理车辆登记注册手续后C．办理车辆登记注册手续时D．办理车辆登记注册手续前
