题目内容
12.Can eating a chocolate bar every day really prevent age-related memory loss?No.But a new research shows that large amounts of flavones(黄酮类) substances found in cocoa,tea and some kinds of vegetables,may improve age-related memory failure.Dr.Scott Small is a professor of neurology at Columbia University in New York City.He is the lead writer of a research paper describing the effects of cocoa flavones on brain activity.His study involved 37volunteers aged between 50and 69.Researchers gave them a high-level flavones drink made from cocoa beans or a low-level flavones drink.For a period of three months,some subjects got 900milligrams of flavones a day.The others got 10milligrams of flavones each day.Brain imaging and memory tests were given to each study subject before and after the study.Dr.Small says that the subjects who had the high-level flavones drink showed much improvement on memory tests.
The researchers warn that more work is needed to be done because this study was performed only on a small group.Dr.Joann Manson is the lead researcher of a four-year study involving 18,000adults.This study will use flavones capsules(胶囊).The study subjects will be divided into two groups and will take two pills per day.The capsules used will all look the same.But one group's capsules will contain flavones,while the other group will take capsules made of an inactive substance,or placebo.
Dr.Manson says it's not necessary for people to start eating more chocolate,because a person would have to eat a huge amount of chocolate to get the same level of flavones given to the lest subjects.He adds many manufacturers have planned to remove the flavones from their chocolate products.Similarly,Dr.Manson says a cocoa-based flavones extract (提取) may be developed in the future.But he says that more studies are needed to see how much flavones is good for our health.
32.What was done to the subjects after Dr.Small's study?C
A.They were asked to take a high-level flavones drink.
B.They were given capsules containing flavones.
C.They were given brain imaging and memory tests.
D.They were asked to take two pills of flavones capsules per day.
33.What's the similarity of the 2experiments?D
A.Both use high-level flavones capsules.
B.The number of the subjects is the same.
C.Drinks and placebos are used in both experiments.
D.The subjects are divided into two groups in both experiments.
34.Why will Dr.Manson carry out the four-year study?B
A.To prove the first experiment is wrong.
B.To carry out the experiment further.
C.To test how much flavones can improve our memory.
D.To show eating chocolate is better to improve memory.
35.What can we learn from the last paragraph?C
A.It's not necessary for us to eat chocolate.
B.The more we eat flavones,the better our health will be.
C.In the future we can get flavones without eating chocolate.
D.It's easy for people to get the same level of flavones given to the test subjects.
分析 本文是一篇说明文,一项新的研究显示,大量的黄酮类物质,发现在可可,茶和一些蔬菜,可改善老年性记忆障碍.
解答 32.C.细节理解题.第二段倒数第二句Brain imaging and memory tests were given to each study subject before and after每个实验课题前后都要进行大脑图象和记忆测试.故选C.
33.D.细节理解题.前一个实验:第二段倒数第三句 For a period of three months,some subjects got 900 milligrams of flavones a day.The others got 10 milligrams of flavones each day.三个月时间,有的人一天服用900毫克黄酮,另一些人每天服用10毫克.后一个实验:第三段第三句 The study subjects will be dividedinto two groups 这项研究课题将会被分为两组.可以判断这两个实验的共同点是都分为两组,故选D.
34.B.细节理解题.根据最后一句 But he says that more studies are needed to see how much flavones is good for our health但是他说,需要更多的研究来表明吃多少的黄酮对我们的健康有好处.故选B.
35.C.细节理解题.根据最后一段Dr.Manson says it's not necessary for people to start eating more chocolate,because 3 persons would have to eat a huge amount of chocolate to get the same level of flavones given to the rest subjects可知答案C正确.
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.