牛津译林版高中英语选修七unit2fitforlifeperiodtwo课件1内容摘要：
ht be used to treat illnesses caused by bacteria. 6. What difficulties did Fleming have in developing penicillin as a drug? First he was unable to find a procedure to make penicillin pure enough to work as a medicine. Second, it was difficult to produce penicillin in the ample quantities needed to be effective. Further reading Read the passage again and try to fill in the following form. Time Development 1900 1971 sold in shops in the from of tablets Proved to reduce the risk of heart attacks Time Development 1977 2020 used to prevent strokes used to reduce blood sugar levels Time Development 1928 1940 1944 discovered by Alexand。阅读剩余 0%
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