问题详情

Section C Directions:In this section, you will hear three recordings of lectures or talks followed by three or four questions. The recordings will be played only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. Questions 16 to 18 are based on the recording you have just heard. 16.
A.They should be done away with.
B.They are necessary in our lives.
C. They enrich our experience.
D.They are harmful to health.请帮忙给出正确答案和分析，谢谢！