Scientists believe that not seeing food on the table also allows the body to know when it is full in real time rather than remembering past experiences where it might have taken a full plate to feel full.

　　In the experiment, 50 people were blindfolded and 40 were allowed to see their food. All were told not to eat within two hours of the experiment. They were then given three 95g bowls of chocolate ice­cream and invited to eat for 15 minutes. Their bowls were taken away and the remaining ice­cream weighed, while the participants were quizzed on how much they thought they had eaten.

　　On average the group who could see ate 116g while the blindfolded groups ate 105g. However, the blindfolded group believed they had eaten 197g while compared with 159g for the non­blind volunteers. They were also asked how pleasant the ice­cream tasted and the blindfolded group rated lower than those who could see.

　　"The experienced pleasure of eating was significantly lower in the blindfolded group.Not seeing the food might have decreased the appetite. Sight plays an important role in the eating experience and in the overall dining experience."

　　Previous studies have shown that the visual influence of food plays a large part in the taste. While restaurants that allow diners to eat in the dark state that it triggers other senses, in fact eating in darkness is likely to taste far milder than usual.

语篇解读：本文是一篇说明文。科学家通过研究发现人们在熄灯或者戴着眼罩时用餐可以减肥。

　　4．With the lights out, diners eat less partly because________.

　　A．they want to quickly finish their meals

　　B．they trust their feelings more than ever

　　C．they focus more on fun than the calories

　　D．they worry about the quality of the food

　　解析：选D 　细节理解题。根据第一段最后一句可知，当关灯后，饮食者可能会担心食物的质量。故答案选D。

　　5．We can learn from the passage that the blindfolded group________.

　　A．spent a much longer time eating the same food

　　B．believed they ate more than they really did

　　C．depended on past experiences to feel full

　　D．thought the food tasted better than usual

解析：选B 　细节理解题。根据第二段最后一句以及实验过程可知，戴眼罩的志愿