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31.What is the purpose of the textA.To provide latest career guidance.B.To introduce a social phenomenon.C.To analyze a new cultural difference.D.To highlight a unique life experience.DA study published in the journal Nature Geoscience last week revealed soil samples collectedby China's Chang'e-5 lunar probe contained impact glass beads(that held water in the formof hydroxyl(),a molecule consisting of one oxygen atom and one hydrogen atom.Hydroxyl ionis one of the most common ions found in water.These glass beads are created when meteoroids()hit the moon's surface,throwing uphot molten droplets which then cool and turn solid.They function like a sponge,soaking uphydrogen atoms carried By the solar wind to form hydroxyl,thus playing a key role in the watercycle of the lunar surface.While each bead only holds a tiny ameunt of water,these glass balls are so ubiquitous on themoon researchers estimated lunar soils could store as much as 270 billion metric tons of water.Fordecades,scientists thought the moon was bone dry until discoveries in recent years revealed its soilcould hold water."The moon potentially holding 270 billion metric tons of water is quite substantial,though itpales in comparison to the amount of water in the Earth's oceans,"said Hu Sen,a researcher fromthe Institute of Geology and Geophysics of the Chinese Academy of Sciences.These findings not only provide insight on the origins,storage,and trapsportation of water oncelestial()bodies without atmospheres,but they also may prove helpful for planning andbuilding a sustainable human habitat on these planets,he added.32.What do glass beads on the moon's surface function?A.As a sponge taking in hydrogen atomsB.As meteoroids hitting the moon's surface.C.As hydroxyl beneath the lunar surface.D.As a source of energy for water cycle.33.What does the underlined word"ubiquitous"mean in paragraph 3?A.Rare.B.Common.C.ObviousD.Energetic.英语试题第7页共12页
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