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1、精选优质文档-倾情为你奉上2020届高三英语专项训练阅读理解D篇（一）A new study shows that rising levels of planet-warming gases may reduce important nutrients in food crops.Researchers studied the effects of one such gascarbon dioxideon rice. The researchers grew rice plants in a controlled environment. They set carbon dioxide lev
2、els to what scientists are predicting for our planet by the end of the century. They found that the resulting rice crops had lower than normal levels of vitamins, minerals and protein. The researchers said the effects of planet-warming gases would be most severe for the poorest citizens in some of t
3、he least developed countries. These people generally eat the most rice and have the least complex diets, they noted.In the experiment, scientists grew 18 kinds of rice in fields in China and Japan. They pumped carbon dioxide gas over the plants in an effort to create the atmosphere of the future. Ri
4、ce grown under high carbon dioxide conditions had, on average, 13 to 30 percent lower levels of four B vitamins and 10 percent less protein. The crops also had 8 percent less iron and 5 percent less zinc（锌）an rice grown under normal conditions.However,vitamin E levels increased by about 13 percent o
5、n average.The results are bad news, “especially for the nutrition of the poorer population in less-developed countries,” said the University of Tokyos Kazuhiko Kobayashi, who helped to write the report. That includes about 600 million people in Indonesia, Cambodia, Myanmar, Bangladesh, Laos and othe
6、r nations, mainly in Southeast Asia, the report said.One of the scientists is Sam Myers of Harvard University in the American state of Massachusetts. He said that findings like this are an example of the surprises climate change create. “My concern is there are many more surprises to come,” he said.
7、Myers noted that pollution, loss of some species, destruction of forests, and other human activities are likely to produce unexpected problems. He said that you cannot completely change all the natural systems that living organisms have grown to depend on over millions of years without having effect
8、s come back to affect our own health.The new study suggests a way to lower the nutritional harm of climate change. One way, Kobayashi said, is grow different forms of rice that have shown to be more resistant to higher carbon dioxide levels.32. Which county would be influenced most by planet-warming
9、 gases according to the text?A. ChinaB. MyanmarC. AmericaD. Britain33. How is Paragraph 3 mainly developed?A. By comparison.B. By giving examples.C. By analyzing causes.D. By describing a process.34. What does the underlined sentence in Paragraph 5 mean?A. Climate change will be difficult to predict
10、.B. Climate change will lead to more good effects.C. Climate change will be harmful to environment.D. Climate change will cause more unexpected problems.35. Which of the following statements is true according to the text?A. Myerssaid we could change all the natural systems for the sake of our health
11、.B. The poorest people in all the least developed countries would be influenced most.C. The researchers grew 18 kinds of rice in China and Japan in a controlled environment.D. Protein in rice grown under high carbon dioxide conditions is increased by 10 percent.BADC（二）Plants are boring. They just si
12、t there (光合作用)while animals have all the fun. Right? Not so much. A new study has found that there is a long history of interactions between ants and plants. The ant and plant co-evolution(协同进化)started with ants feeding on plants and plants evolving ant-friendly features.Plants make a number of diff
13、erent structures that are specific for ant use. Some plants have evolved features that persuade ants into defending them from attack from other insects and even mmml. h nlud hollow thorns that nt will live nd, or tra ntr (琼浆) n lv or stems for the ants to eat. Some ants will just cheat and take the
14、nectar and run, but some will stick around and attack anything that tries to hurt the plant. Other plants get ants to help them move their seeds around, by providing them with rich food packets attached to the seeds. The ant will pick up the seed and carry it away, eat the food packet, and leave the
15、 seed - often in a nutrient-rich area where itll grow better, and since its farther away from its parent, they wont have to compete for resources.But scientists werent sure how the evolutionary relationship between ants and plants got started. If evolution is an arms race between species developing
16、ways to make use of their neighbors, then scientists wanted to know whether plants or ants fired the first shot. It was a chicken-and-egg question, whether things started with ants developing behaviors to take advantage of plants, or plants evolving structures to take advantage of ants.The history of ants and plants evolving together goes back to the time of the dinosaurs
