【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”可知人类一天应该有两次睡眠，夜间的和午间的，但英国人却抑制了午间的，即不睡午觉，故选B。

【正确答案】 A

【答案解析】解析：文中提到“It is a remnant of the same primeval programming that makes all animals in the bush rest in the hot afternoon sun to conserve energy”，可知在炎热的午后小憩的是灌木丛中的动物，故选A。

【正确答案】 B

【答案解析】解析：文中提到“so that one pint at lunchtime is equivalent，in effect，to a quart in the evening”可知，司机们中午喝1品脱啤酒相当于晚上喝1夸脱(2品脱)，故选B。

【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 feeling very groggy and sleepier than to be gained with”可知，午睡超过15分钟反而会引起困倦感，故选C。

【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，when people are more alert．Indeed，we find that it has about twice the effect．‘This has more sinister implications．If people take alcohol up to the legal driving limit，their performance is seriously impaired after lunch．’he said”可知，中午喝一品脱的酒带来的影响是晚上喝相同数量的酒的两倍，而晚上喝一品脱的酒可能会是清醒的。由此可推知，晚上喝一品脱的酒应该是可以开车的，但是中午喝这么多却是不行的。注意文中提到的1夸脱相当于2品脱，故选A。