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Scientists wished to check what would happen to the seeds after being exposed to extraterrestrial(地球外的)forces in lunar orbit and also hoped that they could develop beneficial mutations(突变)This mission offered good opportunities to scientists,which enabled them to deepen their studies onthe effect of cosmic rays on the growth and evolution of life on Earth.Space-based mutation breeding refers to the process of exposing seeds to forces such asmicrogravity,vacuums and cosmic radiation during a spaceflight and then sending them back to Earthfor further observation and planting.Researchers observe and examine several generations of plantsgrown from space-bred seeds and investigate their mutations-some are positive and desirable whileothers are negative.Those with positive mutations will be kept and analyzed,and will be introducedto farmers after their certification and approval.Space breeding can generate mutations faster and more conveniently than ground-basedexperiments and can bring about some desirable traits that are otherwise hard to introduce.Compared with natural or conventionally bred types of plants,space-developed versions withpositive mutations usually feature higher nutritional content,greater annual yields,shorter growthperiods and better resistance to diseases and insect pests.China conducted its first space breeding experiment in 1987,using a satellite to carry seeds intospace.Since then,hundreds of kinds of seeds and seedlings have traveled with dozens of Chinesespaceships.Space breeding has helped to produce more than 200 new types of mutated plants inChina that have been approved for large-scale cultivation,ranging from grains to vegetables and fruits.The Chang'e-5 robotic mission returned 1,731 grams of lunar rock and soil to Earth,marking ahistoric accomplishment 44 years after the last lunar substances were taken back.32.Why were the seeds placed inside Chang'e-5?A.To pick out the fittest for mutations.B.To understand extraterrestrial forces.C.To study the intensity of cosmic rays.D.To expose them to a special environment.33.What do we know about space-based mutation breeding?A.It is not a time-consuming process.B.Mutations develop in a random way.C.It often brings about desirable effects.D.Approval will be granted to mutated plants34.What can we learn from the last paragraph?A.It is a custom to put seedlings on a spacecraft.B.China was the first to do the space breeding experiment.C.It is some time since seeds were last taken into space.D.Space breeding has brought us commercial benefits.35.What is the best title of the passage?A.Space-bred Seeds Offer Great ChancesB.Chang'e-5 Returns with a Big PackageC.Plant Mutations Result in a Better LifeD.Seeds From Space Mark a New History第四次月考英语第7页（共12页）