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单选题 英语六级
2016-11-08

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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参考答案

D

答案解析

Q：What do we learn about memory supplements in eastern cultures?
【解析】D。短文中提到，在很多东方文化里，这类补充剂是由经过训练的医师开给患者的处方，并规定了一定的剂量。D是短文中的原词再现。

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