2.B.细节理解题.根据第二段第一句"NASA had launched the MAVEN spacecraft in the hope of answering that very question."可知发射这个探测器是为了解决一个问题.根据第一段"But why did the atmosphere on Mars change so greatly?"可知这个问题是"火星的空气变化为什么如此之大?"故选B.3.D.细节理解题....
Mars' atmosphere is over 100 times thinner than Earth's and is primarily composed of carbon dioxide, nitrogen and argon gases. Oxidized dust particles kicked up from the Martian surface fill the atmosphere turning Mars' skies a rusty tan color, according to NASA. Water exists on Mars but ...
The atmosphere of Mars is so thin and so cold, say the textbooks, that surface water would immediately vaporize or freeze. Eager to spy more of the enigmatic features, Michael Malin and Kenneth Edgett of Malin Space Science Systems, which built and operates the camera, scrutinized the ...
【1】The surface of Mars shows a wide range of geologic features, including huge volcanoes-the largest known in the solar system-and extensive impact cratering. Three very large volcanoes are found on the Tharsis bulge, an enormous geologic area near Mars’s equator. Northwest of Tharsis is th...
The temperature on Mars is much colder than on Earth. But then, the planet is also farther from the sun. The small, barren planet also has a thin atmosphere that is 95 percent carbon dioxide. This combination of factors makes Mars a harsh and cold world whose temperature can drop to as...
The atmosphere is all the air surrounding the earth. Without it, we would be forced to see k shelter from the sun, as there would be no atmosphere to protect us from the sun's deadly rays. Large and powerful, the atmosphere consists of an ocean of gases hundreds of miles high. It pr...
It was China's first Mars program to make scientific researches about the soil(土壤),environment, atmosphere(大气),water and so on. In May 2021, two photos and two videos were taken by its probe during and after the country's first landing on the red planet. The program was named after...
Landing on Mars is really d___162___. It requires entering the atmosphere at very high speeds, then slowing down b___163___ landing. As to Tianwen-1, a heat shield ( 防热护罩) p___164___ the spacecraft during the landing, after which the mission safely parachuted (使空降) down...
6.As is well-known,to(传导) an electric current means to transmit electrons. 7.It’s not a(科学的) way to test their opinions. 8.Mars has an insubstantial atmosphere,consisting almost (完全地) of carbon dioxide. 9.Economists have been concerned with establishing(证明) for their arguments....
Chilly Mars Mars is too cold for advanced lifeforms The low temperatures result from: A lack of water vapour in the air (water is a good greenhouse gas, but it’s all locked up in ice) A generally much thinner atmosphere (due to low planetary mass) It’s a long way from the Sun ...