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

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

admin2008-12-13  50
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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