On the first two nights of testing，the patients wore caps with no water. On the next two nights, the caps were worn, but the water was not cooled. Then the researchers cooled the water a little for another two nights. On the final two nights of the study, the temperature of the water was made much cooler. The researchers found that the water caps didn' t help the patients until the temperature was about 14℃. Most of the patients fell asleep faster and slept better when the coolest water was moving around their head.

　　Dr. Nofzinger and Dr. Buysse noted that this was only the beginning of the brain temperature study. But they believed they had discovered something important that needed more research.

　　文章大意：最近的一项研究发现，降低大脑的温度有助于失眠者睡一个好觉。

　　1．The first paragraph is written to ________.

　　A．explain how serious insomnia is

　　B．bring forward the topic of the passage

　　C．tell us the causes of sleeping problems

　　D．tell us the danger of having sleeping problems

　　答案：B　推理判断题。第一段用问答的方式介绍了几个对付失眠的方法，接下来文章介绍一个有关治疗失眠的新的研究发现，可见第一段是为了引出主题。

　　2．From the passage we know that “cerebral hypothermia” is actually ________.

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