[解析]
(1)B 词义猜测题.根据第二段"But a study published in Neuroscience and Biobehavioral Reviews in April suggests that sugar can make us feel worse rather thanboostour moods.但4月份发表在《神经科学和生物行为评论》上的一项研究表明,糖会让我们感觉更糟,而不是( )我们的情绪."可知boost的意思应该是和feel worse 是相反的,所以和A项" improve改善"意思相近.故选B.
(2)A 细节理解题.根据第四段"They found that people who have too much sugar become more tired and less alert within an hour,and that these feelings become more intense (强烈的) over time.他们发现,糖分过多的人在一个小时内会变得更累、更不警觉,而且随着时间的推移,这些感觉会变得更加强烈."可知吃了糖之后感觉更累了.故选A.
(3)A 细节理解题.根据第五,六段"According to the researchers,when people take in sugar,their blood sugar levels rise rapidly,leading to a burst of energy and a short "feel good" period.However,as they begin to digest (消耗) the sugar,their blood sugar levels decrease quickly,leading to a bad feeling.To remain on a "high",people are likely to eat more and more sugar until they become addicted to it.As with caffeine,this prevents the body from relaxing,leaving people feeling tired and less alert研究人员称,当人们摄入糖时,他们的血糖水平迅速上升,导致能量爆发和短暂的"感觉良好"时期,然而,当他们开始消化(消耗)糖时,他们的血糖水平迅速下降,导致不好的感觉.为了保持一个"高",人们可能会吃越来越多的糖,直到他们对它上瘾.就像咖啡因一样,这会阻止身体放松,让人们感到疲劳和不太警觉."可知我们的情绪和血糖水平有关.故选A.
(4)D 推理判断题.根据"But the study findings needn't make us think we must give up sweet food altogether.According to the World Health Organization,it is healthy to have the sugars found naturally in fruit,vegetables and milk,so long as these make up less than 5 percent of daily total energy intake,So the next time you feel tired and can't concentrate,perhaps you should think twice before you bite into a chocolate bar.Maybe a spot of exercise at midday would be a better idea!但研究结果不必让我们认为我们必须完全放弃甜食.根据世界卫生组织的说法,水果、蔬菜和牛奶中天然存在的糖是健康的,只要这些糖不到每日总能量摄入的5%.所以下次你觉得累了,注意力不集中的时候,也许在咬巧克力之前应该三思而后行,也许中午做点运动会更好!"可知吃含天然糖的食物是有用的.故选D.