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  3. Studies of the effect that makes many of us slumber or feel sleepy during the queen’s Speech on Christmas Day have revealed that

Studies of the effect that makes many of us slumber or feel sleepy during the queen’s Speech on Christmas Day have revealed that

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问题      Studies of the effect that makes many of us slumber or feel sleepy during the queen’s Speech on Christmas Day have revealed that changes may be required in Britain’s drink drive legislation.
     Dr James Home, director of the Sleep Research Laboratory at Loughborough University, is investigating post-lunch sleepiness. "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."
     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. "Hot environments make it worse and many cultures living near the equator", says Dr Home, "have conceded to the inevitable, where the afternoon siesta is the way of life."
     In this studies, Dr Home has been investigating the role of alcohol. "The theory is that if you are more sleepy after lunch then it figures that alcohol will be more potent after lunch. 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. It seems that alcohol interacts with the circadian rhythm of sleep to cause afternoon sleepiness, so that one pint at lunch-time is equivalent, in effect, to a quart in the evening. "For this reason, most drivers ought not to drink at all at lunchtime and the legal blood alcohol limit is no guide to’ safe’ driving here, "said Dr Home.
     For those who wish to enjoy the Queen’s speech, Dr Home recommends mild exercise, a splash of cold air or cold water on the face, or a cup of coffee. Otherwise, take a cat nap. But this should be less than 15 minutes, "otherwise, sleep really sets in and one can wake up feeling very groggy and far sleepier."
It can be inferred that______.
选项 A、people are not allowed to drive after they drink one quarter in the evening
B、people are still allowed to drive after they drink one quarter in the evening
C、people are still allowed to drive after they drink out pint at lunch-time
D、none
答案A
解析 通过文章第五段，可以知道人们在午饭时喝酒的效力比晚饭时喝酒大得多，但是，立法上只规定了晚上开车时的酒精含量标准，并没有规定中午的标准：the legal blood alcohol limit is no guide to‘safe’ driving here．据此，A 正确。
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