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【单选题】
护士在社区中对一组慢性支气管炎的病人和一组未患慢性支气管炎但具有可比性的健康人，调查他们的吸烟历史，其目的是通过比较两组的差别，检验吸烟与慢性支气管炎有无因果联系的假设，这种研究方法是A.
描述流行病学研究
B.
病例对照研究
C.
队列研究
D.
临床实验研究
E.
社区人群试验研究
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【单选题】Alice ,how do your parents like.pop music. - my dad my mom likes it. They both prefer Beijing Opera.
A.
either or
B.
neither nor
C.
not only but also
D.
both and
【单选题】--- Jim, how do your parents like country music? - ___ my dad ____ my mom likes it. They both like country music.
A.
Either, or
B.
Not only, but also
C.
Neither, nor
D.
Both, and
【单选题】—Alice, how do your parents like pop music? — my dad my mum likes it.But they both like Beijing Opera.
A.
Either; or
B.
Neither; nor
C.
Not only; but also
D.
Both; and
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