Ⅱ.阅读理解(科普研究类＋人物故事类)

　　A

　　(2017·东北三校高三联考)

　　Some colors people see late at night could cause signs of clinical depression.

　　That was the finding of a study that builds on earlier study findings. They show that individuals who live or work in low levels of light overnight can develop clinical depression.

　　Doctors use the word “clinical depression” to describe severe form of depression.

　　Signs may include loss of interest or pleasure in

　　most

　　activities,

　　low

　　energy levels

　　and thoughts of death or suicide.

　　In the new study, American investigators designed an experiment that exposed hamsters(仓鼠) to different colors. The researchers chose hamsters because they are nocturnal, which means they sleep during the day and are active at night.

　　The animals were separated into four groups. One group of hamsters was kept in the dark during their night­time period. Another group was placed in front of a blue light, a third group slept in front of a white light, while a fourth was put in front of a red light.

　　After four weeks, the researchers noted how much sugary water the hamsters drank. They found that the most depressed animals drank the least amount of water.

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