24.What is the scientific research about?
A.Athletes'living habits.
B.Athletes'mental health.
C.Causes of athletes'injuries.
D.Ways to reduce athletes'pressure.
25.Why did Simone Biles quit the team final?
A.She was in a bad state of mind.
B.She was badly hurt in the first round.
C.She was not good at the difficult moves.
D.She did not live up to her trainers'requirements.