【单选题】

Questions 18 to 20 are based on the following passage.At the end of the passage, you will be given 15 seconds to answer the questions.

Now listen to the passage.
Which statement about the research isCORRECTA．The researchers studied a thousand people of the same age but with different jobs.
B．The research showed that the front and side parts of the brain not controls the character, feelings and intellects.
C．The back part of the brain will not contract gradually with the age.
D．The researchers collected the data without the computers.