28. The word “circadian” in line 4 is closest in meaning to ______.
(A) a moderate degree of wetness, especially of the atmosphere
(B) a silver-white malleable ductile light metallic element
(C) the sleep-wake pattern over the course of a 24-hour day
(D) a compound formed by the union of water with some other substance
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統計: A(8), B(10), C(73), D(3), E(0) #3263593
統計: A(8), B(10), C(73), D(3), E(0) #3263593