The word "liberate" (Line 5, Paragraph 2.could be best replaced by ___

A．emancipate

B．discharge

C．surrender

D．save

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参考答案

答案解析

定位：根据题干信息“liberate”(Line 5，Paragraph 2)可直接定位到第二段第三句。
解析：原文提到： “食物进入胃以后，肠壁细胞就会分泌出一种物质；然后，它在血液中流动并刺激胰腺释放胰液，而胰液能够促进消化。”emancipate意为“解放”，discharge意为“释放”，surrender意为“投降”，save意为“保存”。B项与liberate的意思相符，故为正确答案。

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