A (A) smile can be observed, described, and reliably (B) identify; it can also be elicited and manipulated under (C) experimental (D) conditions.Đoạn văn20/88A (A) smile can be observed, described, and reliably (B) identify; it can also be elicited and manipulated under (C) experimental (D) conditions.smileidentifyexperimentalconditionsGiải thíchChọn B