26. According to researchers, our tension may result from ________ .
(A) our diet
(B)our sleeping habits
(C) hormone called cortisol
(D) malfunction of the liver
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統計:
A(2), B(9), C(183), D(4), E(0) #2280711
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未解鎖
根據研究人員的說法,我們的緊張可能源於 ...