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【单选题】
谷类食物是中国传统膳食的主体，是人体（ ）的主要来源。A.
能量
B.
蛋白质
C.
脂肪
D.
水分
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【单选题】— May I put my luggage on the seat beside you, sir, if it is free? — ____. [ ]
A.
Sure, with pleasure
B.
Okay, please yourself
C.
Well, never mind
D.
Yes, help yourself
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