问题
单项选择题 A2型题
某研究机构研制出一种可预防某种传染病的新疫苗，为观察该疫苗的流行病学预防效果，应观察下列何种人群（）
A.隐性感染率高的人群
B.预期发病率低的人群
C.免疫水平高的人群
D.预期发病率高的人群
E.预期患病率低的人群
答案
参考答案：D
解析：为了评价一种新疫苗的流行病学效果，应选择易感人群，即预期发病率高的人群。
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某研究机构研制出一种可预防某种传染病的新疫苗，为观察该疫苗的流行病学预防效果，应观察下列何种人群（）
A.隐性感染率高的人群
B.预期发病率低的人群
C.免疫水平高的人群
D.预期发病率高的人群
E.预期患病率低的人群
参考答案：D
解析：为了评价一种新疫苗的流行病学效果，应选择易感人群，即预期发病率高的人群。
Do you like going to a zoo to see ____1___? How about ____2___ a zoo and feeding the animals yourself? It's not a joke. It happened both in a film and in the ____3___. Benjamin Mee is a newspaper writer in Los Angeles, the US. His wife dies and he has to ____4___ his two young kids. Hoping for a fresh start for his family. Mee ____5____ his job and buys an old house on 73000 square meters ____6___ the city. The land comes with a special gift: a zoo in the country called the Rosemoor Animal Park! The zoo was ____7___ because of the economy crisis (经济危机). With ____8___ raising them, about 200 animals are still living there. The Mee family decide to help reopen the zoo. But it's not an easy job ____9___ they have no experience and little money. There are also unexpected ____10___, such as a bear running away one day. This is the story of American movie We Bought a Zoo. It tells the real amazing story of Benjamin Mee.
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