15. When the ______ temperature drops, we burn more fuel to maintain a steady body temperature. We even possess a special form of fat tissue, known as brown fat, which is burned to produce heat directly.
(A) tertiary
(B) ambient
(C) whimsical
(D) robust
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統計: A(13), B(66), C(13), D(17), E(0) #3432176
統計: A(13), B(66), C(13), D(17), E(0) #3432176