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【单选题】
前瞻性队列研究与流行病学实验的根本区别是A.
是否人为控制研究条件
B.
是否在现场人群中进行
C.
是否检验病因假设
D.
是否设立对照组
E.
是否进行显著性检验
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反馈参考答案：
举一反三
【简答题】We had a __(wonder) trip last weekend.
【简答题】dominated; charged; no wonder; compelled to; response 1. In the 20th century, when telephone calls our work lives, it was awful. 2. When we listened to our voicemail, we felt respond. 3. Taking ju...
【简答题】During our visit to the USA, we had a (wonder) time in the Disney World.
【单选题】What does the speaker encourage employees to do?
A.
Sign a petition
B.
Use public transportation
C.
Write a letter to the mayor
D.
Volunteer to clean up Olivia Street
【单选题】During our visit to the USA, we had a _____________ time in the Disney World.
A.
wonderful
B.
wonder
【简答题】1877 年,() 认为生物群落或自然群落中相互之间的关系以及他们对象是生态环境的长期适应的结果。
【单选题】The past two years ________ a sharp rise in oil price, which adds to the burden of auto transportation industry.
A.
witnessed
B.
has witnessed
C.
is witnessing
D.
witnesses
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