As time wears on, experts want to see how they get along with each other, and how they relate to mission control.

　　One potential problem may come late in the game, when a depression known as “third­quarter syndrome” kicks in. There is also the issue of communication breakdown between the crew and ground control, which happens often in these kinds of missions, Binsted said.

　　47．“A white dome” in Paragraph 1 is the same place as ________.

　　A．“deep space” in Paragraph 2

　　B．“their igloo­like enclosure” in Paragraph 3

　　C．“the slopes of Mauna Loa” in Paragraph 4

　　D．“Purdue University’s School of Industrial Engineering” in Paragraph 4

　　48．What is the aim of Hawaii Space Exploration Analog and Simulation (HI­SEAS)?

　　A．To reduce the time to reach Mars to less than 8 months.

　　B．To make sure if humans can withstand the radiation involved in the journey.

　　C．To find out the possible risks of having people travel to Mars and stay there.

　　D．To aim for a human mission to Mars by the 2030s.

　　49．It can be inferred from the passage that________.

　　A．it is likely to take a year for adventurers to have a to­and­back trip of Mars

　　B．most adventurers­to­be are healthy, educated people in their 20s and 30s, each with a keen interest in science and space

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