37. The passage explains that the tears caused by blinking actually try to ____.
(A) show how sad you are
(B) wash away dirt or dust that gets into your eyes
(C) keep the eyes moving
(D) all of the above
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統計: A(2), B(229), C(1), D(17), E(0) #939743
統計: A(2), B(229), C(1), D(17), E(0) #939743