【正确答案】 B

【答案解析】解析：文中提到“We humans are designed to sleep twice a day,once at night and a short napafter lunch，but in this part of the world we tend to repress that．”，故选B。

【正确答案】 A

【答案解析】解析：从“It is a remnant of the same primeval programming that makes all animals in thebush rest in t11e hot afternoon sun to conserve energy．”可知答案为A。

【正确答案】 B

【答案解析】解析：从“so that one pint at lunch time is equivalent，in effect，to a quart inthe evening．”可知中午喝1品脱啤酒相当于晚上喝1夸脱(2品脱)。

【正确答案】 C

【答案解析】解析：由“But this should be less than 15 minutes，otherwise，sleep really sets in and one canwake up feeling very groggy and far sleepier than to be in with．”可知。

【正确答案】 A

【答案解析】解析：从“One would figure then that a pint of beer at lunchtime has more effect than in theevening，when people are more alert．Indeed,we find that it has about twice the effect．”Thishas more sinister implications．“If people take alcohol up to the legal driving limit，theirperformance is seriously impaired after lunch．”可知。