雅思阅读精选：药物实验及成果

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　　You should spend about 20 minutes onquestions 14-26, which are based on ReadingPassage 2 below.

　　Question 14

　　Choose the most suitable title for Readingpassage 2 from the list below. Write your answer inbox 14 on your answer sheet.

　　A Old Remedies Still Work Today.

　　B The Forest Pharmacy.

　　C Miracle Cure From Nature.

　　D A Modern Cure For An Ancient Killer

　　A

　　The search for cures to treat common diseases is not new, nor is it unusual to find thecures for such diseases in tree bark. Aspirin for headaches and quinine for the treatment ofmalaria are both examples of modern medicines which have been derived from tree bark. Butthe latest additions to this list may be the most significant yet, according to the findings ofresearch into the medicinal benefits of the bark of the African Bush Willow. At an internationalconference, Dr Scott Remick of the USA claimed that combretastin, a product of this bark,has proved up to 85% effective in combating cancer, and may, in combination withchemotherapy, finally provide a way to destroy many types of tumour.

　　B

　　The African Bush Willow, which grows in South Africa, has been recognised as a medicinalplant by local tribespeople for many years. In the past, its roots were used as purgatives andits gum was used to treat sores and ulcers. Common along river banks in southern Africa, thisplant (scientific name, Combretum caffrum) has proved both hardy and prolific, It is one of theworld's fastest-growing trees and can grow one metre in height annually to a maximum offourteen metres. To sustain this level of growth normally requires warmth, rich soil andabundant water. but even when these are in short supply, the African Bush Willow cansurvive. It is resistant to severe drought and even sustained periods of frost, andtemperatures well below zero do not damage the tree.

　　C

　　Combretastin, the active ingredient in the bark, was originally isolated form the stemsand branches in the 1970a by South African researcher, Dr Gordon Cragg. A massive seventy-seven kilogrammes of material was needed from the tree to produce just a few milligrams ofthe active ingredient. However, scientists have now been able to produce the drugsynthetically. This type of manufacturing has meant that the drug can now be mass-producedand used much more widely in the treatment of cancer. Most cancers are caused by tumours,which create their own network of capillaries to supply the blood they need in order to grow.The effect of combretastin is to reduce the tumour's ability to create these capillaries andthereby starve the tumour to death.

　　D

　　Combretastin appears to work very quickly, often reducing the blood flow to a tumourwithin four to six hours after its first application. A feature in its favour is that combretastindoes not appear to affect the blood supplies to other healthy organs. But, used in isolation, asmall number of cancerous cells which appear able to live off normal blood supplies, appear toremain unaffected by combretastin, and radiation therapy is required to destroy these cellsand remove the threat of cancer altogether.

　　E

　　Initial trials have been carried out on twenty-five patients in the USA. These have met with aremarkable measure of success. One 55-year-old man, suffering from a particularlyaggressive form of thyroid cancer before treatment, has been cancer-free for two yearsfollowing a course of the new drug. It is generally held that if a cancer does not return withintwo years of treatment, it has been cured. So far, other patients involved in the trials sincethen, including those with cancer of the bowel, have also remained clear of their cancers.

　　F

　　Trials in the UK have met with similar success, but have reported significant side effects,including diarrhoea and skin pain. In Britain, experts believe that the drug works best inconjunction with other therapies, including radiotherapy. The results of these combinedtreatments suggest that 85% of cancers could be totally eliminated, and similar trials are due tostart in the USA. Dr Kate Law of the Cancer Research Campaign in London comments, "We willbe watching the results of these trials with interest. On the face of it, these latest trials are veryencouraging.

　　G

　　The drug has been greeted with enthusiasm by professionals and patients alike despitesome of the experiments having limited success. One patient suffering from lung and livercancers agreed to be one of the guinea pigs in the pharmaceutical trials. Fortunately he metwith a degree of success in that his respiratory organs have been clear for over a year.However, this has not been the case with the other source of cancer and as yet the new drughas had no marked effect on it. Nevertheless, researchers are continuing in their quest to find acure for all forms of cancers and they are confident that a breakthrough is on the horizon.

　　Questions 15-17

　　Choose the best answers A, B, C or D. Writeyour answers in boxes 15-17 on your answer sheet.

　　15. The active ingredient of combratastin wasfound in which part of the tree?

　　A the gum　　 B the branches

　　C the roots　　D the leaves

　　16. According to the text, medicines NOT derivedfrom tree bark, have been used to cure whichcondition?

　　A sores　　 B malaria

　　C cancer　　D migraine

　　17. According to the text, which of the following has not as yet been cured usingcombretastin?

　　A bowel cancer　　B thyroid cancer

　　C liver cancer　　D lung cancer

　　Questions 18-20

　　Write NO MORE THAN THREE WORDS from Reading Passage 2 for each answer, Write youranswers in boxes 18-20 on your answer sheet.

　　18 Researchers believe that advances will be made in ...... in finding cures for all types ofcancer.

　　19 The African Bush Willow is extremely sturdy and can survive long intervals in very low...... .

　　20 In Britain, researchers believe that most cancers can be cured using combretastintogether with ...... .

　　Questions 21 - 26

　　Reading Passage 3 has seven paragraphs, A-G. Choose the most suitable headings forparagraphs B-G from the list below. Write the appropriate numbers i-x in boxes 21-26 onyour answer sheet.

　　There are more headings than paragraphs, so you will not use them all.

　　List of Headings

　　i Strange Medicine vi Ongoing Research

　　ii How the Drug Works vii Research Campaign

　　iii Robust and Versatile viii Artificial Substitutes

　　iv Plants Growing ix Happy Patients

　　v Universal Approval x Additional Consequences

　　21 Paragraph B ......　　22 Paragraph C ......

　　23 Paragraph D ......　　24 Paragraph E ......

　　25 Paragraph F ......　　26 Paragraph G ......

　　参考答案：

　　14. C 15.B 16. A 17.C 18. the (near) future 19.temperatures

　　20. other therapies/radiotherapy 21. iii 22. viii23. ii 24. ix 25. vi 26. v

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