A. Plasma TV sets are so thin that you can hang them on a wall
B. TV screens have become bigger and bigger
C. TV sets used to be very thin
D. Most TVs sold today show color pictures
C
Dẫn chứng: TV sets have become bigger. Most TVs sold today show color pictures. TV screens have become bigger and bigger while TV sets have become thinner. In fact, Plasma TV sets are so thin that you can hang them on a wall.
Đáp án đúng: C. TV sets used to be very thin
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