50. Why is late-afternoon cup of coffee discussed in the last paragraph?
(A)Sleep time may be lengthened because of it.
(B)According to the study, it may be interfering sleep at night.
(C)It is, in fact, encouraged because caffeine will make one feel sleepy.
(D)The intake of caffeine in late afternoon will change our perceptions of sleep quality.

46. What is the purpose of the passage? (A)To argue for the importance of caffeine consumption in a day. (B)To illustrate how to sleep well after drinking afternoon coffee. (C)To dispel the misconception of caffeine overdose before sleep. (D)To report a recent study on caffeine consumption before sleep.

47. According to the passage, why is the study significant? (A)The study was first to examine the effect of various amount of caffeine on nightly sleep. (B)The study was first to include participants’ written sleep diaries to keep their sleep records. (C)The study investigated the effect of caffeine on nightly sleep in specific times before bedtime. (D)The study recruited volunteer males and females to participate in the experiment on caffeine consumption.

48. What does the word both in the third paragraph refer to? (A)Sleep time and sleep efficiency.(B)At bedtime and three hours before bed. (C)Three hours and six hours before bedtime.(D) Caffeine consumptions and sleep perception.

49. What was contradictory between the volunteers’ perceptions and the researchers’ observation? (A)The amount of coffee consumption 6 hours before bedtime. (B)Duration of nightly sleep at three different points of coffee drinking. (C)Sleep time and sleep quality when having coffee 6 hours before bedtime. (D)Efficiency in falling completely asleep at three different points of coffee drinking.

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