阅读理解热点话题综合练习02-备战2023高考英语阅读理解热点话题分类训练（高考模拟真题+名校真题）

阅读理解热点话题综合练习02 （2023·四川德阳·四川省绵竹中学统考三模）Sending human travelers to Mars would require scientists and engineers to overcome a range of technological and safety obstacles. One of them is the enormous risk posed by particle radiation from the sun, distant stars and galaxies. Answering two key questions would go a long way toward overcoming that: Would particle radiation pose too serious a threat to human life throughout a round trip to the red planet? And, could the very timing of a mission to Mars help protect astronauts from the radiation? In a new article published in the journal Space Weather, an international team of space scientists with researchers from UCLA, answers those two questions. That is, humans should be able to safely travel to and from Mars, provided that the spacecraft has adequate shielding (防护) and the round trip is shorter than approximately four years. And the timing of a human mission to Mars would indeed make a difference: The scientists determined that the best time for a flight to leave Earth would be when solar activity is at its peak, because the most dangerous and energetic particles from distant galaxies are deflected (偏移) during solar maximum. Imaginably, the average flight to Mars takes about nine months, so it is reasonable that a human mission could reach the planet and return to Earth in less than two years,according to Yuri Shprits, a UCLA research geophysicist and co-author of the paper.: “This study shows that although space radiation imposes (追使) strict limitations on how heavy the spacecraft can be and the time of launch, and it presents technological difficulties for human missions to Mars, such a mission is viable,” said Shprits, who also is head of space physics and space weather at GFZ Research Centre for Geosciences in Potsdam,Germany. 1．What are the two questions about? A．Getting rid of the technological obstacles. B．Making astronauts return from Mars safely. C．Protecting astronauts from particle radiation. D．Launching the