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One of the many difficulties to humans freely exploring and inhabiting(居?。㎝ars is the planet's lack of oxygen.Luckily NASA's Perseverance Rover("毅力"號火星探測器)can help.Using an instrument called MOXIE (short for Mars Oxygen In-Situ Resource Utillzation Experiment),the rover successfully took carbon dioxide from the Martian atmosphere and turned it into oxygen.NASA said it plans to conduct more MOXIE tests.
MOXIE ran its first test for roughly an hour,producing just under six grams of oxygen.That's enough to keep an astronaut going for about 10 minutes.It won't keep someone alive for long,but it's a key step forward in exploring Mars.Not only could that oxygen be used to allow people to breathe,but it would also lighten the load for return missions to Earth,or for trips to other parts of the solar system.Rockets need oxygen to burn fuel during liftoff.Being able to create it on Mars would mean spacecraft can bring less of it from Earth,significantly cutting down their weight.Less weight means less overall fuel needed to launch rockets.
Oxygen is the heavier part of rocket fuel.If NASA wanted to get four astronauts of Mars,the spacecraft would need 27.5 tons of oxygen to do it.Keeping those four breathing for a year would require about one ton.At the rate MOXIE is going,producing 27.5 tons would take more than 475 years.But future devices(設(shè)備)could be larger and more efficient than the 38-pound MOXIE.One day,we will come up with a bigger plan for humans when we finally send them there to make enough oxygen.
(1)What's the function of MOXIE? DD
A.To conduct tests on Mars.
B.To help send oxygen to Mars.
C.To find new habitats for humans.
D.To turn carbon dioxide into oxygen.
(2)What remains to be improved in the MOXIE tests? DD
A.Using less fuel to launch rockets.
B.Sending more astronauts to space.
C.Cutting down the weight of rockets.
D.Producing enough oxygen for the mission.
(3)What's the author's attitude towards MOXIE? BB
A.Doubtful.
B.Positive.
C.Indifferent.
D.Unclear.
(4)What's the writing style of this text? CC
A.Argumentative.
B.Narrative.
C.Expository.
D.Descriptive.
【考點】說明文.
【答案】D;D;B;C
【解答】
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發(fā)布:2024/4/20 14:35:0組卷:2引用:1難度:0.5
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D.It suggests that the local people are well educated.發(fā)布:2025/1/6 16:30:6組卷:0引用:1難度:0.5 -
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D.To inform diverse views on the changes of Roald DahI's books.發(fā)布:2025/1/30 8:0:1組卷:1引用:1難度:0.4