1. 听对话，回答问题。

Hi, Mary. How was your trip?<br />Exciting. I went to the Great Wall with my parents.<br />Really? How long is the Great Wall?<br />If we are only talking about the parts from the main dynasty, it's about 8,850 kilometers long.<br />Diz makes it the longest wall in the world.<br />Wow, that's amazing. Why did the ancient emperors build the wall?<br />The main reason was to protect their part of the country. It's quite tall and wide.<br />Is Badling part of the Ming Great Wall?<br />Yes, it's the most famous part. I will show you the photos I took there tomorrow.<br />Okay. I can't wait.

1. （1） Why did the ancient emperors build the Great Wall?

   A . To let the world remember them. B . To protect their part of the country. C . To let China become strong.
3. （2） What is the most famous part of the Ming Great Wall?

   A . Jiayuguan. B . Badaling. C . Juyongguan.