2 . When it comes to making healthy lifestyle changes, which should come first-changing your diet or becoming more physically active?
Previous studies suggested that providing people with too much information about nutrition and physical activity at once tends (趋向) to be discouraging. That has led to the popularity of advising people to make changes gradually, and set smaller goals.
So the scientists divided 200 inactive participants who were 45 or older into four groups. One group was instructed in making diet and fitness changes at the same time; the second group was taught about diet changes first, and then fitness changes four months later; the third group changed their exercise habits first and made changes in their eating habits four months later; and the final, control group was not instructed in either diet or fitness changes but in how to manage their stress.
The researchers followed the groups for a full year. Compared to the control group, the three intervention (干预) groups made healthy changes in their diet. Those who changed their fitness habits first significantly increased the amount of exercise they received daily compared to the other groups after four months. However, at the end of the year, the group that changed both diet and exercise at the same time was the only one that met the nationally recommended targets for both exercise and nutrition levels, while those who worked on improving their nutrition first were unable to meet the recommended levels of fitness after a year. The researchers suspect that changes to diet are easier to make than changes to physical activity.
The findings show, however, that pairing diet and exercise changes may help to overcome some of the barriers people face in adding more physical activity into their lives. If folks change diet and exercise orderly, the scientists say, they may end up placing more importance on the first set of behavior changes and feel less pressured to address the second set.
1. How is Paragraph 3 developed?
| A．By giving examples. | B．By making comparisons. |
| C．By analyzing causes. | D．By making classifications. |
2. Which group was the most physically active after four months?
| A．The first group. | B．The second group. |
| C．The third group. | D．The control group. |
3. What might the scientists approve of?
| A．Changing eating habits first may be reasonable. |
| B．Diet and exercise changes should be made orderly. |
| C．Diet and exercise changes are equally hard to make. |
| D．Diet and exercise should be processed at the same time. |
4. Which of the following is probably the title of the passage?
| A．Changing your habits for better health |
| B．Ways to lead a healthy and balanced life |
| C．Making healthy lifestyle changes really counts |
| D．Timing matters in making diet and exercise changes |
