本题目来源于试卷: Unity and Diversity A.5 Viruses，类别为 IB生物学
[问答题]
1.Outline the methods of HIV transmission and its e*hr +t ,:j wjn.4ldkrcfbw/o /ffects on the immune sy6snog i+6ila;o cn8(dstem.
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2.Discuss the need for international cooperation to fight contagious diseases such as Ebola.
3.Antibiotics are an essential tool of modern medicine. Outline the strengths and limitations of antibiotics.
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