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题库 / OG2015V-SC-17
Travelers to Mars would have to endure low levels of gravity for long periods of time, avoid large doses of radiation, contend with the chemically reactive Martian soil, and perhaps even having to wardoff contamination by Martian lifeforms.
contend with the chemically reactive Martian soil, and perhaps even having to ward
contend with the chemically reactive Martian soil, and perhaps even warding
contend with the chemically reactive Martian soil, and perhaps even ward
contending with the chemically reactive Martian soil, and perhaps even to ward
contending with the chemically reactive Martian soil, and perhaps even warding
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