When Justin was a child，his parents always let him do lots of housework such as taking out the rubbish and sending newspapers.His childhood friends often felt sorry for him.But when he grew up，he was better than his childhood friends and lived a happier and healthier life.
   According to a 40-year study，the children will have a richer and a happier future if they work hard in childhood.Helping do the housework is one of the most important childhood activities.These children believe they can do something to the world.They feel they are important members of the world.And because they felt good about themselves，others felt good about them，too.
   The study collected all the information about these children.It followed them when they were at ages 25，31 and 47.The researchers compared the children's mental-health（心理健康）grades with their childhood-activity grades.It showed that children were more healthier when they were active in childhood activities such as doing chores and doing part-time jobs.And these children were more likely to work hard in school and solve problems independently.
   Working at any age is important.Childhood activities help a child develop responsibility（責(zé)任感），independence and confidence（自信）.They also help the child understand that people must work together and work toward common goals.
（1）Justin's friend felt sorry for him because

A

A

.
A．Justin needed to do much housework
B．Justin was better at school learning
C．Justin didn't feel happy to do the housework
D．Justin couldn't go out to play
（2）According to the study，

C

C

is good for children's mental health.
A．studying hard
B．solving problems
C．doing housework
D．playing with friends
（3）What does the underlined word "goals" mean in Chinese in the last paragraph？

B

B

A．團(tuán)隊
B．目標(biāo)
C．記憶
D．角色
（4）What's the main idea of the passage？

A

A

A．Childhood activities are good for one's future.
B．Everyone should do chores to be independent.
C．Children shouldn't do housework.
D．Mental health is important for children.