把（2千克）：（4000克）化成最简整数比是____，它们的比值是____。

    I'm Lisa. My father is a doctor. He often drives his car to work. My mother is an English teacher. She always walks to work. She says walking is a good way to exercise. My mother also likes going shopping. She often does some shopping on Sundays. I am a student. I usually ride a bike to school, but sometimes I come to school by bus. I like watching TV. I only watch TV on Saturday and Sunday evenings.

下列说法正确的是 (       )

1866年，清朝官员斌椿奉命考察欧洲，所著《乘槎笔记》被认为是中国知识分子最早亲历欧洲的记述。下列项中，不可能在其笔记中出现的是(  )