Because a headache is not a disease, it will not cause serious influence on our

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问题 Because a headache is not a disease, it will not cause serious influence on our daily life. [br] The drugs used to prevent migraines can block the______ effects, which may cause the blood vessels to expand.

选项

答案 beta

解析由题干中的drugs和prevent migraines定位到第一个小标题的第5点内容的第2、3句Antidepressant drugs and beta-blockers have been shown to…These drugs work in the body to block what are called the beta effects，one of which is expansion of the blood vessels．此处需填入名词性成分。题干中的The drugs used to prevent migraines和原文中的Antidepressant drugs and beta-blockers指的都是预防偏头痛的药物；题干中的which may cause the blood vessels to expand与原文中的 one of which is expansion of the blood vessels属同义转述，因此原文中effects的定语就是答案。

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