They ate the same kind of food as real astronauts would have. They rarely showered, and took urine(尿)and blood samples every day to complete more than 100 mock(模拟的)missions, including dealing with emergencies, space walking and conducting scientific experiments.

　　They rarely had the chance to communicate with their families. The biggest challenges the men faced were isolation, claustrophobia(幽闭恐怖症)and boredom. Although they were firmly anchored(固定)by gravity—the only difference from the real Martian environment—this did not stop them from feeling as if they were thousands of miles away from home.

　　“I really felt a physical(实实在在的)distance between our crew and the people in Mission Control. My reason knows that they’re just 20 meters away from us but my mind can’t accept it, ”Frenchman Romain Charles wrote to Reuters the night before his return.

　　Participants were allowed to quit the test at any time if the stress got too much for them, but none of them did and there were only minor disagreements among the team.

　　According to Alexander Suvorov, one of the project’s top officials, the mission had been a resounding(令人瞩目的)success. He said it proved that human beings are strong enough for long-distance space travel. (391W)

　　1. The“Mars500”experiment is intended to　.

　　A. collect data about Mars

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