The average ,... watches television for about 15 hours a week

* Hướng dẫn giải

Đáp án D

Spectator = a person who is watching an event, especially a sports event

Observer = a person who watches somebody/something

Audience = the group of people who have gathered to watch or listen to something (a play, concert, somebody speaking, etc.)

Viewer = a person watching television

Câu này dịch như sau: Lượng người xem tivi trung bình khoảng 15 giờ một tuần.