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33. How much sleep do experts recommend teenagers between 14 and 17 get each night?
(A) 5 to 7 hours
(B) 8 to 10 hours
(C) 11 to 13 hours
(D) Over 14 hours
答案：登入後查看
統計： A(1), B(79), C(4), D(1), E(0) #3440493
統計： A(1), B(79), C(4), D(1), E(0) #3440493
