10. (1) Pilots and flight attendants have long known that they become especially forgetful when they fly
often with little rest.
(2) He decided to find out why people with jet lag become especially forgetful.
(3) A scientist named Kwangwok Cho, who had to fly across the Atlantic several times in one month,
notice the same problem with his short-term memory.
(4) People usually think of this loss of short-term memory as part of jet lag, the negative effects that
many people feel after long flights.
(5) They lose their car keys, forget their room number at a hotel, or forget the names of people they
have just met.
(A) 34215
(B) 43215
(C) 15432
(D) 51432