【期末备考】专题07：六选四—上海名校2023年高二下英语试卷精选汇编（附答案解析）

【期末备考】专题07：六选四 — 上海名校2023年高二下英语试卷精选汇编（含答案） 学校:___________姓名：___________班级：___________考号：___________ 一、六选四 （2022秋·上海·高二复旦附中校考期末）Chocolate Is Beneficial in Some Cases Mental arithmetic became easier after volunteers had been given large amounts of compounds found in chocolate, called flavanols (黄烷醇), in a hot cocoa drink. They were also less likely to feel tired or mentally drained, the findings, presented at the British Psychological Society annual conference in Brighton show. Prof David Kennedy, director of the brain, performance and nutrition research centre at North-umbria University, and a co-author of the study, said that chocolate could be beneficial for mentally challenging tasks. ___1___ “For things that are difficult to do, mentally demanding things that maybe crop up in your work, it would help.” Prof Kennedy said. The flavanols, part of a group of chemicals called polyphenols (多酚), work by increasing the flow of blood into the brain. For the study 30 volunteers were asked to count backwards in groups of three from a random number between 800 and 999 generated by a computer. ___2___. However, the same was not true when the group was asked to count backwards in groups of seven, which the researchers described as more complex task, requiring a slightly different part of the brain. The findings also show that the volunteers did not get as tired doing the calculations if they had been given the cocoa drink, despite being asked to do them over and over for an hour. The researchers gave the volunteers a total of 500 mg of flavanol. ___3___. Emma Wightman, one of the study’s lead researchers, said: “You can get bars of chocolate that have 100 mg of flavnoal, and we are also going to look at the effect of lower doses of flavanol on the brain.” Prof Kennedy added: “The amount that you are giving is more than in the diet but there is quite a lot of evidence that general amounts are protective against declining function and that kind of thing. ___4___. A．Volunteers’