【正文】 stern .”可以得出答案。 Washington and Thomas Jefferson are mentioned in paragraph 3 as _____ explorers politicians pawpaw planters lovers 【答案】D 【解析】根據(jù)文章“Pawpaws reportedly were a favorite treat of George Washington, the first , who especially liked them Jefferson, the third , was also s fan of the fruit.”可以得到答案。 is difficult to sell the pawpaw on a large scale for the following reasons EXCPEPT that the fruit _____ a very special environment a very short harvest season not taste good difficult to preserve after harvesting 【答案】C 【解析】根據(jù)文章“The fruit requires a very special environmentlow, wet areas that sometimes has a very short harvest season, from two to three weeks in September and addition, the fruit is good to eat for only two to three days after makes it hard to sell anywhere distant from the pawpaw tree it es from.”可以得到答案。 festivals are organized in some states _____ a way of celebrating harvest part of the traditional culture display pawpaw growing techniques reintroduce people to the fruit 【答案】D 【解析】根據(jù)文章“In several states farmers have organized “pawpaw festivals” to reintroduce people to food.”可以得到答案。Passage Two Throughout history, humans have suffered from a condition that they have never been able to escape— researchers, however, believe we may be thinking about it in the wrong say we should start treating ageing itself as a disease—one that can be prevented and hopes are founded on recent discoveries that suggest biological ageing may be entirely preventable and a biological preventive, the body ages at different rates according to genetic and environmental errors build up in our DNA and our cells begin developing faults that can grow into tissue damage, which leads to ageing and ageing—related of the leading figures in human life research, Aubrey De Grey, explains in an interview that their goal is to develop a set of therapies for middleaged and older people that will leave them physically and mentally equivalent(相當(dāng)?shù)?to someone under the age of 30.“Of course, without wiping their memories,” he he doesn’t think that is will be possible to stop ageing sees a future where “rejuvenation technologies” can be applied to old people in order to revert their cells to what they were like when they were in their youth, buying them extra idea is that someone who is treated at the age of 60 will be biologically reverted to because the therapies are not permanent cells will end up being 60 years old again in another 30 years “treating ageing itself as a disease”, some researchers mean _____ people are liable to diseases can be dealt with like a disease is a disease hard to cure should be treated carefully 【答案】B 【解析】根據(jù)文章“They say we should start treating ageing itself as a disease—one that can be prevented and treated.”可以得出答案。 age at different rates due to _____ and environmental and cellrelated 【答案】C 【解析】根據(jù)文章“From a biological preventive, the body ages at different rates according to genetic and environmental factors.”可以得出答案。 goal of De Grey’s research is to people’s age people younger ageing altogether people’s memories 【答案】B 【解析】根據(jù)文章“One of the leading figures in human life research, Aubrey De Grey, explains in an interview that their goal is to develop a set of therapies for middleaged and older people that will leave them physically and mentally equivalent to someone under the age of 30.”可以得出答案。 does “rejuvenation”()possibly mean? to cells to young.【答案】D 【解析】rejuvenation一詞的意思為“返老還童”. will happen if someone is treated with De Grey’s technology? will stay young for a longer time will no longer grow will live up to at least 60 years will not get ageingrelated diseases.【答案】A 【解析】根據(jù)文章“Their cells will end up being 60 years old again in another 30 years time.”可以得出答案。Passage ThreeWhen jack Davis, 9, looks up at the night sky, he doesn’t see just the sees his fourth grader from New Jersey has a deep interest in outer space and the alien(外星的)beings he thinks might live July, Jack heard that NASA was looking for a new planetary protection officer and decided he was the right person for the position, which focuses on preventing astronauts from accidentally bringing extremely small, potentially dangerous alien lifeforms back to Earth and ensuring that astronauts do not take Earthbased germs with them into space, pays from $124,406 to $187,000 per wrote a letter to NASA, noting his qualifications for the job.“My sister says I am an alien,” Jack wrote, pointing out that since he is young, he can “l(fā)earn to think like an alien.” He signed the letter “Jack Davis, Guardian of the Galaxy.”Within days, Jack received a personal letter from NASA’s planetary science director, James .“We are always looking for bright future scientists and engineers to help us,” Green wrote.”I hope you will study hard and do well in hope to see you here at NASA one of these days!”Jack said he was “shocked” when Green’s response arrived.“I shouted, I got a letter from NASA!”Green says he loves to answer letters from calls his response a “gravity assist.” Spacecraft use gravity assistance from objects like planets and moons to help power the craft toward another celestial(天上的) hopes a reply can influence a person’s path in life in a similar of the following can best describe Jack Davis? 【答案】B 【解析】根據(jù)文章“The fourth grader from New Jersey has a deep interest in outer space and the alien(外星的)beings he thinks might live there.”可以得出答案。 is the job responsibility of the planetary protection officer? ensure the mental and physical health of the astronauts protect Earth from possible alien attacks in the future keep harmful substances form spreading between Earth and outer study the unknown substances astronauts brought back to Earth 【答案】C 【解析】根據(jù)文章“The position, which focuses on preventing astronauts from accidentally bringing extremely small, potentially dangerous alien lifeforms back to Earth and ensuring that astronauts do not take Earthbased germs with the