(单选题)
Americans eat ______ as they actually need every day; they actually waste almost half of what they take in daily.
A.twice as much protein
B.protein as much twice
C.twice protein as much
D.protein as twice much
参考答案：A
参考解析：
考查倍数表达法。句意：美国人每天摄入的蛋白质是实际需要量的两倍；实际上，他们每天摄入的蛋白质几乎浪费了一半。即“...times as...as...”结构。在两个as之间可用many（修饰可数名词）、much（修饰不可数名词）和其他相应的词。故选A。
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