27. According to this passage, what leads passengers not to fall asleep faster and have a longer sleep duration on planes?
(A) higher temperatures
(B) muscle cramps
(C) blood clots
(D) low hydration
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統計: A(61), B(11), C(4), D(11), E(0) #3263592
統計: A(61), B(11), C(4), D(11), E(0) #3263592