We use very little energy to maintain a fat store, _____a protein store needs a

游客2025-03-20 5

问题 We use very little energy to maintain a fat store, _____a protein store needs a lot.

选项 A、whereas
B、in contrast to
C、on the other hand
D、since

答案 A

解析本题考查连词的用法，两个分句是平行对比关系，所以用whereas。我们用很少的能量维持脂肪的积存，却用很多的能量维持蛋白质的积存。

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