46. What did researchers find puzzling about the first-night effect
A) To what extent it can trouble people.
B) What role it has played in evolution
C) What circumstances may trigger it.
D) In what way it can be beneficial.
47. What do we learn about Dr. Yuka Sasaki doing her research
A) She found birds and dolphins remain alert while asleep.
B) She found birds and dolphins sleep in much the same way.
C) She got some idea from previous studies on birds and dolphins.
D) She conducted studies on birds’and dolphins’ sleeping patterns.
48. What did Dr. Sasaki do when re-running her experiment
A) She monitored the brain activity of participants sleeping in a new environment.
B) She recruited 35 participants from her Department of Psychological Sciences.
C) She studied the differences between the two sides of participants’ brains.
D) She tested her findings about birds and dolphins on human subjects.
49. What did Dr. Sasaki do when re-running her experiment
A) She analyzed the negative effect of irregular tones on brains.
B) She recorded participants’ adaptation to changed environment.
C) She exposed her participants to two different stimuli.
D) She compared the responses of different participants.
50. What did Dr. Sasaki find about the participants in her experiment
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.
51. What does the author say is the problem with women
A) They are often unclear about the career goals to reach.
B) They are usually more committed at home than on the job.
C) They tend to be over-optimistic about how far they could go.
D) They tend to push themselves beyond the limits of their ability.
52. Why do working women of child-bearing age tend to feel drained of energy