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选修3
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Unit8-Topic Talk
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Unit8-Writing Workshop
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Unit9-Topic Talk
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epidemic
n.传染病;流行病
virus
n.病毒
variation
n.变化物;变体;差异;变动
factor
n.因素;要素
bacteria
n.细菌
officially
adv.官方地;正式地
classify
vt.将…分类;把…归入一类
rare
adj.稀有的;罕见的;不常发生的;稀少的;
baseline
n.(医学、科学)基线;准线
opposed
adj.与某事物相反;反对某事物;不赞成某事物;与某种事物相反;