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

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

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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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