Questions 16 to 18 are based on the recording you have just heard.16. (1)A) To categorize different types of learners.B)To find out what students prefer to learn.C)To understand the mechanism of the human brain.D) To see if they are inherent traits affecting learning.17.(2)A) It was defective.B) It was misguided.C) It was original in design.D) It was thought-provoking.18.(3)A) Auditory aids are as important as visual aids.B) Visual aids are helpful to all types of learners.C)Reading plain texts is more effective than viewing pictures.D) Scientific concepts are hard to understand without visual aids.Questions 19 to 21 are based on the recording you have just heard.19.(4)A)Not playing a role in a workplace revolution.B) Not benefiting from free-market capitalism.C)Not earning enough money to provide for the family.D) Not spending enough time on family life and leisure.20.(5)A) People would be working only fifteen hours a week now.B)The balance of power in the workplace would change.C) Technological advances would create many new jobs.D) Most workers could afford to have a house of their own.21. (6)A) Loss of workers' personal dignity.B) Deprivation of workers' creativity.C) Deterioration of workers' mental health.D) Unequal distribution of working hours.