1 Though the human brain constitutes only 2 percent of an adult's body weight, it consumes a fifth of his or her _________energy.
(A) metaphoric
(B) metaphysical
(C) metamorphic
(D) metabolic

Though the human brain constitutes only 2 percent of an adult's body weight, it consumes a fifth of his or her metabolic energy.

雖然人類的大腦只占成人體重的2%，它卻消耗掉1/5的新陳代謝所產的能量。

(A) metaphoric- 隱喻的。(英文寫作的用法；見similes vs metaphors vs imaginary, figure of speech)

(B) metaphysical- 抽象的/ 超自然現象的

(C) metamorphic – 變質的/ 變形的/ 改變結構的

(D) metabolic – 新陳代謝 – 可分為anabolism 合成代謝 & catabolism 分解代謝

Though the human brain constitutes only 2 percent of an adult's body weight, it consumes a fifth of his or her metabolic energy. 

雖然人類的大腦只佔成年人體重的2％，但它消耗了他或她的代謝能量的五分之一。

(A) metaphoric 

(B) metaphysical 

(C) metamorphic 

(D) metabolic

（A）隱喻

（B）形而上學

（C）變質

（D）代謝