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(黃酮類) 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(膠囊).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。 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 本文是一篇說明文,一項新的研究顯示,大量的黃酮類物質(zhì),發(fā)現(xiàn)在可可,茶和一些蔬菜,可改善老年性記憶障礙.
解答 32.C.細節(jié)理解題.第二段倒數(shù)第二句Brain imaging and memory tests were given to each study subject before and after每個實驗課題前后都要進行大腦圖象和記憶測試.故選C.
33.D.細節(jié)理解題.前一個實驗:第二段倒數(shù)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.三個月時間,有的人一天服用900毫克黃酮,另一些人每天服用10毫克.后一個實驗:第三段第三句 The study subjects will be dividedinto two groups 這項研究課題將會被分為兩組.可以判斷這兩個實驗的共同點是都分為兩組,故選D.
34.B.細節(jié)理解題.根據(jù)最后一句 But he says that more studies are needed to see how much flavones is good for our health但是他說,需要更多的研究來表明吃多少的黃酮對我們的健康有好處.故選B.
35.C.細節(jié)理解題.根據(jù)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正確.
點評 考察學生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.