Question 15 is based on the passage you have just heard.

They have often proved to be as helpful as doing mental exercise.

Taking them with other medications might entail unnecessary risks.

Their effect lasts only a short time.

Many have benefited from them.

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答案：

解析：

15. What does the speaker say about memory supplements at the end?

解析：B。四个选项都是对they或them的效果的描述，推测题目问药品的作用。录音结尾指出，很多时候人们没有意识到这类药物的危害，也不知道和其他药同服可能增加风险。故B选项“与其他药物同服可能带来不必要的危险”为正确答案。A选项“事实证明它们和脑力训练同样有效”、C选项“它们的药效只持续一小段时间”和D选项“它们使很多人收益”均未提及，排除。

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