饲料中有哪几种化学成分？
参考答案：
水分、粗灰分、粗蛋白、粗脂肪、粗纤维、无氮浸出物6大成分
You are growing so fast. Can you tell me ______ now? [ ]
A. how fast are you
B. how fast you are
C. how tall are you
D. how tall you are
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