A. He wanted to know how they work.
B. It was his hobby.
C. It made him feel safer.
D. He had found a book on them
A
Dẫn chứng: To get ready for the flight John did lots of reading about airplanes. When he booked his seat, he was told that he would be flying on a Boeing 747, which is better known as a jumbo jet. "I needed to know as much as possible before getting in that plane. I suppose it was a way of making myself feel better. The Boeing 747 is the largest passenger aircraft in the world at the moment.
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