Helen Steward
Excrise 1 :
According to an old ( 1 ), in the early seventeenth century a Peruvian was cured ( 2 ) a terrible fever by eating the bark of the cinchona tree. Quinine, the drug which can be ( 3 ) from cinchona bark, was ( 4 ) widely used as medicine until 1816
Quinine has proved invaluable to modern medicine. It is used in the ( 5 ) of malaria, a ( 6 ) transmitted by the anopheles mosquito and common in the tropical ( 7 ) of the world. Quinine preparations are also used to help cure typhoid fever, rheumatic fever, and ( 8 ) sickness
The conchona tree belongs to the evergreen family and unlike most, evergreen, ( 9 ) very fragrant flowers. Cinchona trees are native to South America, but are now ( 10 ) in such other places as India, Ceylon and Java.
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