A new study，a project of the researchers from the University of Pittsburgh in Pennsylvania，finds that a fitness tracker （健康追蹤器） probably does not help with weight loss．
   The trackers are designed to record your physical activity．They are usually worn around the wrist （手腕），where they record a person's heart rate．The research team looked at two groups of people．The first wore a fitness tracker and took part in health consultation with experts for best weight-loss plan．The researchers compared this group with people who only got health consultation．
   The study found that those only speaking with the health experts lost nearly 6 kilograms，but those using a fitness tracker lost only 3.5 kilograms．John Jakicic，the lead researcher，questioned the use of these trackers for weight loss．
   The study involved 470 people aged between 18 and 35．Some of them were overweight，while others were considered obese．Over three fourths of them were women．All were told to increase physical activity and start on a low-calorie diet．They had their weight measured once every six months．After six months，researchers divided the group into two parts：one continued with monthly consulting，while members of the other group were given a fitness tracker．Eighteen months later，both groups showed great improvements in fitness，physical activity and diet，with no big difference between groups．However，when it came to losing weight，the people who only spoke with experts lost nearly twice as much weight．
   Jakicic said， "The study's findings are important because effective long-term treatments are needed to deal with America's obesity．" More information is needed，he added，to learn how to best use these trackers to help adults who want to lose weight．

（1）Both groups of people in the study were asked to

C

C

．
A．start on a high-calorie diet
B．wear a fitness tracker
C．consult experts
D．record their heart rates
（2）Why does Jakicic think the findings are important？

C

C

A．Wearing fitness trackers hardly helps people lose weight．
B．Physical activity and diet have no effect on weight loss．
C．Dealing with obesity needs effective long-term treatments．
D．There are great differences in health between both groups．
（3）What can we infer about the study mentioned in the text？

A

A

A．The study went on for about two years．
B．More than 120 men took part in the study．
C．Health consulting helps lose almost 6 kilograms．
D．Wearing a fitness tracker is useful for keeping slim．
（4）The purpose of the text is to

B

B

．
A．describe how the researchers carried out the study
B．show regular consulting for weight control is necessary
C．persuade readers to wear fitness trackers for weight control
D．warn women are more likely to suffer from weight problems