Who have found a protein called M2? How many causes of bad breath does the passage cite?

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问题 Who have found a protein called M2?
How many causes of bad breath does the passage cite?

选项 A、One.
B、Two.
C、Three.
D、Four.

答案C

解析 此题为跳读题。在BAD BREATH部分(即第4、5、6段),作者使用了another cause,the most common reason等表达,据此可知作者共提及三种原因。
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