14.打哈欠可增進血液流動，有助保持最佳體能狀態。
(A) When you yawn to enforce blood flows, your body is thus at the best operation.
(B) Yawning speeds up bleeding and helps maintain the best functioning condition of vessels.
(C) Yawning increases blood flow and helps maintain optimum levels of physical functioning.
(D) People yawn and the bleeding speeds up; the vessel is then kept at the best condition.

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