Section B
Passage One
26.
A. Adjusting his biological clock.
B. Knowing the direction of a jet.
C. Realizing the time difference during flight.
D. Getting used to the weather of a new place.
27.
A. 24.
B. 36.
C. 48.
D. 72.
28.
A. To explain the cause of jet lag problems.
B. To teach us how to avoid jet lag problems.
C. To explain the differences between zones.
D. To show the ways to arrange time properly.

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