四 阅读下面材料，从方框中所给的A—E五个选项中选出正确选项（其中一项是多余选项），将其序号填入第1—4小题，并回答第5小题
A bike-riding programme for middle school students can help improve their mental(心理的) health, according to a new study from the Loma Linda University School of Medicine in California.
The programme, called Riding for Focus(R4F), was organised by the nonprofit（非营利的）Outride. Coaches spent six to eight weeks, at least three days a week, teaching middle school students cycling skills and riding outdoors with them.
1. ______
For this study, Loma Linda University had students fill out surveys before and after the programme to compare their mental condition. 2. ______
The study found that there was a general increase in students' happiness after completing the cycling programme. “We saw that there were mental health advantages across the whole population,” Sean Wilson, a writer of the study, said in an interview. “3. ______”
“Middle school is an important time to pay attention to mental health because that's when many young people start to experience social pressure and stress from school,” said Esther Walker, a programme manager at Outride. 4. ______ “The freedom and relief(轻松) that can come with going out for a bike ride could be helpful for students,” Walker said.

5. Would you like to join R4F? Why or why not?（不超过15词）

B
; D
; A
; E
; Yes, I'd like to. Because it helps improve my mental health.