【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 nap after 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 the bush rest in the hotafternoon 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 in the 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 can wake up feelingvery groggy and far sleepier than to be in with．”可知C正确。

【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 the evening，whenpeople are more alert．Indeed，we find that it has about twice the effect．”This has more sinisterimplications．“If people take alcohol up to the legal driving limit，their performance is seriously impairedafter lunch．”可知。