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【单选题】
为研究某矿区附近人群多种慢性病的患病率及其分布特点，以了解开矿污染对附近村民健康影响，另选一个远离矿区无污染的村庄为对照，每个选1000名在当地居住10年以上、年龄在20岁以上的居民，进行体格检查并填写健康调查问卷。该种调查方法是()A.
群组病例对照研究
B.
现况研究
C.
社区试验
D.
队列研究
E.
生态学研究
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举一反三
【简答题】Task 3 Listen to a dialogue and complete it.
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【简答题】Listen to a dialogue between Cole and a HR manager in his company and answer the questions below.
【简答题】listen to a dialogue and then fill in the blanks.
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【简答题】Task 3 Dialogue Listen to a dialogue between Sam and Dick and answer the following questions.
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