In the past, doctors couldn’t do anything about stomach ulcers. There has been a change in doctors’ understanding of the cause

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问题 In the past, doctors couldn’t do anything about stomach ulcers.
There has been a change in doctors’ understanding of the cause of stomach ulcers.

选项 A、Right
B、Wrong
C、Not mentioned

答案A

解析 文章第二段中提到,过去医生们认为溃疡通常是由浓胃液损伤胃的组织引起的,但现在他们发现,大多数溃疡是由一种叫做伊利克·贝克特·皮洛利或H·皮洛利的细菌微生物引起的。故A为答案。
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