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 onAnswer Sheet 1with a single line through the centre. Questions 16 to 18 are based on the recording you have just heard.1.[单选题]______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.2.[单选题]______A.They feel stressed out even without any challenges in life.B.They feel too overwhelmed to deal with life’s problems.C.They are anxious to free themselves from life’s troubles.D.They are exhausted even without doing any heavy work.3.[单选题]______A.They expand our mind.B.They prolong our lives.C.They narrow our focus.D.They lessen our burdens.