题目内容
（请给出正确答案）
The chemical substance missing from polished rice______
A．was vitamin B
B．did not affect the chickens
C．was named the Eijkman vitamin
D．has never been accurately identified
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更多“The chemical substance missing…”相关的问题
The next paragraph is most probably about______.
A．how to separate the DNA unwanted substances
B．how different the embalming materials are from mummy to mummy
C．how to take steps to purify the DNA
D．how to take steps to avoid the destruction of the tissue
The graph below illustrates the relationship between the plasma concentration of a substance X and its reabsorption by the kidney. The GFR is 100 ml/min. The renal threshold for this substance is
A、200 mg/dl
B、50 mg/dl
C、100 mg/dl
D、150 mg/dl
E、500 mg/dl
Why does the author mention fresh coffee in Paragraph 2？
A．As an example of complex substances having not been duplicated satisfactorily.
B．Because the coffee fragrance is hard to produce.
C．To conclude the passage.
D．The smell of fresh coffee is inviting.
The graph below illustrates the relationship between the plasma concentration of a substance X and its reabsorption by the kidney. The GFR is 100 ml/min. The renal threshold for this substance is
A、50 mg/dl
B、100 mg/dl
C、150 mg/dl
D、200 mg/dl
E、500 mg/dl
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