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题型：语法填空-短文语填难度：0.65 引用次数：93 题号：15260457

Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper from of the given word; for the other blanks, use one word that best fits each blank.

Tianwen-1 Probe Enters Orbit Around Mars

After nearly seven months in space, China’s Tianwen-1 probe successfully entered the orbit around Mars on February 10. It marks the first time that a Chinese spacecraft 1 (orbit) an extraterrestrial planet, according to the China National Space Administration(国家航天局) .

Tianwen-1 2 (consist) of an orbiter, a lander and a six-wheeled rover carrying scientific instruments. A 3,000-newton engine was fired up at 7:52 p.m. to decelerate the spacecraft. After some 15 minutes, precise braking near Mars helped the probe succeed in 3 (enter) the orbit around the Red Planet. That means Tianwen-1 has become China’s first artificial satellite of Mars and achieved the first goal of its three-step mission - orbiting, landing and roving.

Tianwen-1 makes China the sixth country to ever reach Mars. It 4 (launch) by a Long March-5 carrier rocket, China’s largest launch vehicle, on Jul 23, 2020. The probe has flown 475 million kilometers and was 192 million kilometers away from Earth when it reached the Mars orbit.

Tianwen-1 will now conduct several orbital corrections 5 (enter) a temporary Mars “parking” orbit, 6 (look) for potential landing sites in preparation for a “touch-down” in May or June. The most challenging part of the mission will be the soft landing, an independent process for the probe lasting seven to eight minutes.

Chinese space engineers and scientists have chosen a relatively flat region in the southern part of the Utopia Planitia(乌托邦平原) , the largest plain on Mars, 7 the potential landing zone. The sites was selected for its conditions for a safe landing and scientific value. It has not been investigated by other countries yet. 8 the scientific data can be shared with the international community to enrich the knowledge of the Red Planet.

After the landing, the rover will be set free to conduct scientific exploration and it has an expected lifespan(使用期限) of at least 90 Martian days (about three months on Earth). The orbiter, with a design lifespan of one Martian year (about 687 days on Earth), will relay(接转) communications to and from the rover while carrying out its own scientific detection work, 9 China can succeed in orbiting, landing and roving with Tianwen-1, it will take further challenges on the next Mars mission: collecting and bringing back samples from the surface.

Tianwen-1 means “Questions to Heaven” and comes form a poem written by Qu Yuan, one of 10 (great) poets of ancient China. The name signifies the Chinese nation’s perseverance in pursuing truth and science and exploring nature and the universe.

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更新时间：2022-03-07 10:24:52 |

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【知识点】航空航天

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