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5/5that a human mission could reach the planet and return to Earth in less than twoyears,according to Yuri Shprits,a UCLA research geophysicist and co-author of thepaper.:"This study shows that although space radiation imposes strict limitationson how heavy the spacecraft can be and the time of launch,and it presentstechnological difficulties for human missions to Mars,such a mission is viable,"saidShprits,who also is head of space physics and space weather at GFZ Research Centrefor Geosciences in Potsdam,Germany.28.What are the two questions about?A.Getting rid of the technological obstacles.B.Making astronauts return from Mars safelyC.Protecting astronauts from particle radiation.D.Launching the spacecraft to Mars in shielding29.Which decides the time when humans fly to Mars?A.The distance to starsB.The length of the round trip.C.The size of particlesD.The degree of solar activity30.What does the underlined word "viable"in Paragraph 6 mean?A.Challenging.B.Workable.C.Rewarding.D.Affordable.31.What is the best title for the passage?A.Two Questions,a Help to Humans?B.Particle Radiation,an Obstacle to Mars?C.Travelling to Mars,an Impossible Mission?D.A Round Trip to Mars,Technological Advance?0Every Sunday at 2 p.m.,Marisela Godinez,the owner of El Meson Tequileria,aMexican restaurant in Austin,Texas,used to fill a 12-gallon bucket,plus anotherhalf-bucket,with leftover food from the restaurant's all-you-can-eat brunch buffetWe threw out a lot of food,"she said.But a few months ago Ms.Godinez signed up to use an app called Too Good ToGo.Now,10 customers pick up "surprise bags"of her leftovers for 5.99 each,andshe sends far fewer leftovers to the landfill.Around the country,apps that connect customers to businesses with leftover foodhave begun to spread.The concept is simple:Restaurants and grocery stores throwaway huge amounts of food every day.Rather than trash it,apps like Too Good ToGo and Flashfood help businesses sell it at a reduced price.They claim that thebusinesses and buyers are helping the environment because the food would otherwisebecome food waste,a big contributor to climate change.Food production itself is a major contributor to greenhouse gas emissionsaccounting for between a quarter and a third of global emissions.Each step of theprocess-growing,harvesting,moving,processing,packaging,storing and preparingfood-releases carbon dioxide,methane and other planet-warming gases.When thefood is wasted,so are all those emissions.In addition,once unused food reacheslandfills,it breaks down and releases more methane