D．living in virtual reality without options

　　D

　　(2015·无锡高三模拟)Six people have kept themselves inside a white dome in Hawaii to have an eight­month test of how their mental health might experience during a mission to Mars.

　　The NASA­funded project involves three men and three women who have no access to fresh food and limited access to Internet that

　　requires 20­minute intervals between click and response, as it might be in deep space.

　　They are allowed to step outside their igloo­like enclosure — which measures 11 meters in diameter and six meters tall — only if wearing a space suit.

　　“We are surrounded by basaltic lava (玄武岩火山石) and living on the slopes of Mauna Loa where there is little evidence of plant or animal life，” wrote crew member Jocelyn Dunn, a

　　doctor at Purdue University’s School of Industrial Engineering, after her first day in the dome on October 17. “The training wheels are coming off as our new reality is setting in，” Dunn wrote on her blog, http：// fivestarview. blogspot. com, which she plans to update throughout the mission.

　　NASA is spending DS| 1.2 million on a series of three such projects known as Hawaii Space Exploration Analog and Simulation (HI­SEAS) to determine the potential risks of sending people together to spend long periods on a distant planet.

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