The phrase “in this age group” refers to _______. A. Infants B. People in their twenties C. People in their thirties and forties D. Elderly people
Giải thích
Đáp án B
Thông tin “One exception is founds among people in the twenties, especially women, who show a rise in cold infections, because people in this age group are….” → cụm “in this age group” đề cập đến những người tron gđộ tuổi khoảng 20