The purpose of this text is。 The volunteers in the trial ate potatoes。

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问题 The purpose of this text is______。
The volunteers in the trial ate potatoes______。

选项 A、for fun
B、against gut infections
C、to satisfy their hunger
D、to produce vaccines

答案B

解析见第一段“Researchers in Texas hope that people who eat the potatoes will be protected against common gut infections．”研究者们希望土豆能保护食用者免受普通肠道感染的侵害。

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职称英语卫生类B级

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