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单选题

Question 14 is based on the passage you have just heard.

A
They are available at most country fairs.
B
They are taken in relatively high dosage.
C
They are collected or grown by farmers.
D
They are prescribed by trained practitioners.
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答案：

D

解析：

14. What do we learn about memory supplements in eastern cultures?

解析：D。选项中dosage, prescribed表明they指药品，推测题目与药品的来源和用量相关。录音中提到，这类药在一些东方国家需要开处方，剂量也由经过训练的执业医师所定。故D选项“它们必须由经过训练的执业医师开处方”为正确答案。A选项“他们在多数乡村集市上有售”和C选项“它们由农民种植和采集”均未提及。B选项“它们的服用剂量相对较大”与录音信息不符，录音说用量必须控制在一定水平，故排除。

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