A．a complex medical process

　　B．a psychological treatment

　　C．a simple physical treatment

　　D．a difficult scientific theory

　　答案：C　词义猜测题。根据第二段中的“It is not a complex medical process.”及后文对降温方法的描述可知，它是一种简单的物理疗法。

　　3．In the study，researchers helped people fall asleep faster through ________.

　　A．increasing chemical reactions in the front of their brain

　　B．making them feel safe with a cap on their head

　　C．asking them to drink water to cool down

　　D．lowering the temperature of their brain

　　答案：D　细节理解题。根据第三段中的“Other studies showed that people who had sleeping problems often had more chemical reacitons in the front of their brain. The researchers thought cooling down the brain might help.”可知，应选D。

　　4．What is Paragraph 4 mainly about?

　　A．The cause of the study.

　　B．The function of the caps.

　　C．Some details of the study.

　　D．People's reactions to the study.

　　答案：C　段落大意题。第四段主要是讲这个试验操作的细节。

　　5．Dr. Nofzinger and Dr. Buysse seemed to believe that ____.

　　A．their research wouldn't help people greatly

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