问题详情：
We all know that eating junk food can make us fat. However, a new study suggests that it can do more than that—it can also make us lazy, reported CBS News.
In the study, researchers at the University of California, Los Angeles, US divided 32 female rats into two groups. The first group was fed a diet of healthy food such as corn and fish, while the second was given a diet of highly processed (加工的) food rich in sugar, namely “junk food”.
Within three months, the rats in the second group were already much fatter than those on the healthy diet. And when researchers trained the rats to do simple tasks, they found even more differences between the two groups rather than weight.
During the task – pushing a lever (杠杆) to receive a reward of sugar water – the rats on the junk food diet were found to be less willing to move, and they took longer breaks between each push than the lean(瘦的) rats did.
“It is as if the rat is thinking ‘This is too much work’,” Aaron Blaisdell, leader of the study, told the Los Angeles Times.
But what about the possibility that the fat rats were less passionate about getting sugar water because they were already eating lots of sugar in their daily diet? That’s why researchers repeated the tests by rewarding fat rats with plain water when they were extremely thirsty. However, the results came out just the same.
According to researchers, these differences suggest that junk food changed the chemistry in the rats’ brains.
The experiment didn’t end there. After six months, the rats’ diets were switched, and the overweight rats were given a healthy diet for nine days. However, this change didn’t help reduce their weight or improve their ability to perform tasks, which means the effects of their junk food diet persisted (持续存在). “There’s no quick fix,” said Blaisdell.
For a long time, we’ve believed that people become fat because they are lazy. But this study has proven the opposite to be true as well, which indicates that laziness and obesity are a “vicious cycle (恶*循环)”.
So, if you constantly feel tired, lacking any urge to get up from your chair, it could be that you’ve been studying too hard. But you should also pay attention to your diet.
66. During the first three months of the experiment by researchers at the University of California, ______.
A. rats from the healthy diet group ate nothing but corn and fish
B. rats on the junk food diet ate more than those on healthy diet
C. rats on the healthy food diet performed better at simple tasks than those on the junk food diet
D. rats on the junk food diet seemed uninterested in sugary food
67. The researchers rewarded thirsty rats with plain water in the lever test to ______.
A. help them control their weight
B. test whether fat rats lost interest in the test because they had taken enough sugar
C. change the diet habits of fat rats
D. find out the influence of sugar on rats’ brains
68. The underlined word “there” refers to ______.
A. after the rats on the junk food diet had worked hard to get sugar water
B. after the type of food rats prefer had been identified
C. after a quick cure for obesity had been found
D. after the fact that fatter rats are lazier than lean rats had been found
69. We can conclude from the article that ______.
A. fat people are usually lazier than lean people
B. people should switch between different types of diets to keep healthy
C. being overweight and being lazy can feed into each other
D. laziness is the main cause of weight problems
70. Which of the following is Not Right according to the passage?
A. Eating junk food can make us fat.
B. Researchers got different results after repeated the tests to fat rats.
C. For a long time, we’ve believed that people become fat because they are lazy.
D. If you constantly feel tired or study too hard, you need to pay attention to your diet.
【回答】
CBDCB
知识点：科普环保类阅读
题型：阅读理解
