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Questions 19 to 22 are based on the passage you have just heard.
19
A.Poor memory.
B.Being isolated from friends.
C.Being uninterested in art.
D.Being mentally unstable.
20
A.Make neural connections.
B.Improve genetic structure.
C.Build up a health mind.
D.Expand brain capacity.
21
A.To test the new theory.
B.To improve the brain function.
C.To study the brain.
D.To provide psychological advice.
22
A.It makes use of the Internet.
B.It keeps personal records.
C.It gives detailed feedback.
D.It changes in accordance with the users.
