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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