2. 考研
  3. This is bad news for teenage girls who skip sleep because although the difference in________of calories from fat is small, it ca

This is bad news for teenage girls who skip sleep because although the difference in________of calories from fat is small, it ca

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问题 This is bad news for teenage girls who skip sleep because although the difference in________of calories from fat is small, it can add up over time and cause weight gain.
选项 A、percentage
B、portion
C、rate
D、ration
答案A
解析 本题考查名词辨析。percentage意为“百分比，百分率”，表示部分占整体的比重；portion表示整体中的“部分，一份”；rate意为“比率，速度”；ration表示“(物资紧缺时的)配给量”。句子表示的是从脂肪中摄取的卡路里的不同情况，将选项代入题干，能使句意通顺的只有percentage，故答案为A项。
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