`1.d` 

`=>`Dẫn chứng : Jeana Yeager and Dick Rutan flew around the world. They did not stop. They did not refuel. This had never been done before. They were the first. It took them nine days.

`2.d` 

`=>`Dẫn chứng : It was only 5.6 feet long. They could not stand up in it. They had to take
turns flying and resting. They had to fly above and around storms.

`3.a` 

`=>`Dẫn chứng : 

`-`They had to fly above and around storms.

`-`They did not refuel. This had never been done before. 

`-`It was hard to sleep and move in the small cockpit.