Well, here there are only two choice mentioned as possible treatment for hypertension: one is reading, the other is holding your breathe. If the conclusion says that the former should become a major treatment for hypertension, its benchmark (another treatment) has to be the latter.
It's simple. We know that reading is better than holding breathe. If holding breathe is a known method to lower blood pressure, then reading should be a better treatment.
1)秉住呼吸是否已经是疗法 if answer yes, then reading比已知治疗方法都好,so reading应该成为一种高血压病的主要疗法,strengthen if answer no, then reading may be still a bad method but just better than breath, weaken. 不知道这么说明白不?