【单选题】Questions 11 and 15 are based on the following passage. That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the “first-night” effect....
A.
They tended to enjoy certain tones more than others.
B.
They tended to perceive irregular beeps as a threat.
C.
They felt sleepy when exposed to regular beeps.
D.
They differed in their tolerance of irregular tones.
【单选题】Questions 11 and 15 are based on the following passage. That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the “first-night” effect....