Ⅰ.阅读理解
A
Chinese scientists have discovered a new water reservoir on the moon in the form of glass beads(珠子),which could have major significance for finding out the water content of the earth’s only natural satellite and potentially extracting them to support future lunar missions.
A study published in the journal NatureGeoscience last week revealed soil samples collected by China’s Chang’e-5 lunar probe contained impact glass beads that held water in the form of hydroxyl——a molecule consisting of one oxygen atom and one hydrogen atom.Hydroxyl ion(离子) is one of the most common ions found in water.
These glass beads are created when meteoroids(流星体) hit the moon’s surface,throwing up hot molten droplets(熔滴) which then cool and turn solid.They function like a sponge,soaking up hydrogen atoms carried by the solar wind to form hydroxyl,thus playing an important role in the water cycle of the lunar surface.
While each bead only holds a tiny amount of water,these glass balls can be seen everywhere on the moon and researchers estimated lunar soils could store as much as 270 billion metric tons of water.For decades,scientists thought the moon was bone dry until discoveries in recent years revealed its soil could hold water.“The moon potentially holding 270 billion metric tons of water is quite substantial,though it pales in comparison to the amount of water in the earth’s oceans,” said Hu Sen,a researcher from the Institute of Geology and Geophysics of the Chinese Academy of Sciences and one of the key scientists behind the study.
These findings not only provide insight on the origins,storage,and transportation of water on celestial(天空的) bodies without atmospheres,but they also may prove helpful for planning and building a sustainable human habitat on these planets,he added.
However,the specific origins of the water on the lunar surface remain a mystery.The study presented several potential sources,including solar wind implantation,the release of trapped gas when the moon was hot and volcanically active,and delivery by comets and asteroids.
1.What is the use of the glass beads?
A.Absorbing water.
B.Drying water.
C.Creating water.
D.Recycling water.
2.What is the main idea of paragraph 4?
A.The moon was a dry place for decades.
B.The moon holds as much water as the earth does.
C.Scientists discovered the moon could store water.
D.The amount of water on the moon is comparatively large.
3.What can be inferred from the last paragraph?
A.Trapped gas should be released.
B.Further research needs to be done.
C.Water sources have been identified.
D.Solar wind was implanted on the moon.
4.What can be the best title of the text?
A.Future Habitat for Humans:the Moon
B.New Discovery:Glass Beads on the Moon
C.New Findings:Water on the Lunar Surface
D.Future Missions:China’s Chang’e Lunar Probes
