G

　　The drug has been greeted with enthusiasm by professionals and patients alike despite some of the experiments having limited success. One patient suffering from lung and liver cancers agreed to be one of the guinea pigs in the pharmaceutical trials. Fortunately he met with 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 drug has had no marked effect on it. Nevertheless, researchers are continuing in their quest to find a cure 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. Write your answers in boxes 15 - 17 on your answer sheet.

　　15 The active ingredient of combratastin was found 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 derived from tree bark, have been used to cure which condition?

　　A sores　　B malaria

　　C cancer　　D migraine

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

　　A bowel cancer　　B thyroid cancer

　　C liver cancer　　D lung cancer

　　Questions 18 - 20

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