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A more realistic understanding of how science works can contribute to a better comprehension ofthe decisive role of doubt and skepticism in the scientific process.Indeed,science is not a linear()path leading from one success to another,but rather a constant reevaluation of hypotheses.Failuresare part of the scientific process and should be taught along with successes.28.What is "doubt"in science according to the text?A.It's not right.B.It's a feature.C.It's a bug.D.It's less realistic.29.What does the underlined word "encompass"in paragraph 3 mean?A.Include.B.Oppose.C.Evaluate.D.Discover.30.What does the author say about certainty?A.It's a real power of science.B.It shows the weakness of science.C.It affects the scientific process.D.It helps in discovering the world.31.What can we learn about science?A.Science is always right.B.Failures are part of science.C.It's a path leading to success.D.It is based on people's expectation.DBred to be more sweeter,today's cherries,bananas and apples taste different than they used to-but not necessarily better.Among fruit farmers,the word "quality"is now routinely used as a standardfor "high in sugar",though firmness,color and size are also considerations.In a recent study aboutways to enhance the sweetness of fruit using“molecular(分子的)approaches”,a group of plantscientists wrote that,in general,the sugar content of many fruits are now higher than before owing tocontinuous selection and breeding.Modern apple varieties,the scientists stressed,were on averagesweeter than older ones.The sweetness of fruit depends not just on how it is bred but also on growing conditions,yield andharvest.The lead researcher,Sugiura,said,"If you could taste an apple harvested 30 years ago,youwould feel the difference."He believed that modern apples are picked so early that even if they are bredfor sweetness,they often don't develop their full character.The fragrance()never develops infruit that is harvested too early.Jim Cooper,an apple farmer in England,is regretful to admit the fact that many people will nevertaste the"strawberry hint"in a really ripe Pearmain,a type of heritage apple.In a way,the rise ofconsistently sweeter fruit in our lifetimes has been a victory of plant breeding.After all,it's a rareperson who would seek out bitter grapes if they could have sweet ones instead.But the sweetness of modern fruit is not without its problems,especially for people with diabetes()who have to reduce their intake of higher-sugar fruits.Fruit that is bred sweeter also tendsto be lower in the chemicals that make it healthy.Considering health,maybe the real problem withmodern fruit is that it has become yet another sweet thing in a world with sugar.Even grapefruits,which used to be quite bitter,are sometimes now as sweet as oranges.If you've never tasted a sourcherry,how can you fully appreciate a sweet one?32.In what aspect is many fruits different from before?A.Sugar content.B.Soft skin.C.Bright color.33.Why did Sugiura express discontent with the present fruits?D.High yield.A.They are bred too early.C.They are losing a good flavor.B.They taste so sweet.D.They need a higher yield.英语第5页（共8页）