Who have found a protein called M2? [br] How many causes of bad breath does the

游客2025-01-11 19

问题 Who have found a protein called M2? [br] 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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