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31.Which is the most suitable title for the text?A.Why do you need a college degree?B.Where can you enjoy free education?C.What is a must in the STEM-centric age?D.How much do pcople with a degree carn in US?DAsteroids（小行星)are believed to have formed early in our solar sysiem's historyabout4.5 billion years ago-when a cloud of gas and dust called the solar nebula（太阳星云)cotlapsed and formed our sun and the planets.By visiting these near Earth objects to study thematerial that came from the solar nebula,we can look for answers to some of humnanknd'smost arresting questions.such as:How did the solar system form and where did the Earth'swater and other organic materials such as carbon come from?In addition to ulocking duesabout our solar system,asteroids may provide clues about our Earth By undersiandngeabout asteroids,we may learn more about past Earth impacts and possibly find ways toreducethe threat of future impacts.If we don't want to go the way of the dinosaurs someday,we need to protect ourselvesagainst the threat of being hit by a big asteroid.According to NASA,typically about onceevery 10,000 years,a rocky or iron asteroid the size of a footbali field could crash ito ourplanet and possibly cause tidal waves big enough to flood coastal areas.But what we really have to fear is asteroids about 328 feet across or bigger.Such an ipact would cause a firestorm and fill the atmosphere with sun-blocking dust,which woaldwipe out forests and farm fields and starve the human and animal life that it didn't immediatelykill,That's why it's vital to develop a way to neutralize such a threat to Earth.NASA's Double Asteroid Redirection Test,launched in late November 2021,was the first mission to deonstrate a technology called asteroid redirection by manmade impactor.A robotic spacecraftwill be crashed into an asteroid named Didymos,in an effort to show that it's possible toslightly change the path of an asteroid That would enable NASA to redirect potential threatsto miss Earth.32.What is the first paragraph mainly about?A.How solar system came into being.B.How long asteroids have existed.C.Why asteroids are to be explored.D.When asteroids will impact Earth.33.Why does the author mention dinosaurs in paragraph 2?A.To make the text more interesting.B.To introduce the topic of the text.C.To grab readers'attention to asteroids.D.To show the disaster from an asteroid impact.【高二英语第6页（共10页）】·23-562B·