在一项病例对照研究中，计算出某研究因素与疾病关联强度OR值的95_爱下问搜题

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问题单项选择题

在一项病例对照研究中，计算出某研究因素与疾病关联强度OR值的95%可信区间为0.55～0.80，请问该因素可能为

A．混杂因素

B．危险因素

C．保护因素

D．无关因素

E．以上都不是

答案

参考答案：C

填空题

选词并用其适当形式填空。

fast, thousand, around, city, hope for

     In the fourteenth and fifteenth centuries more and more land was used    l   college buildings. The
town grew much     2   in the nineteenth century after the opening of the railway in 1845.Cambridge
(剑桥) became a   3   in 1951 and now it has a population of over 100,000. Many young students in
other countries     4   to study at Cambridge.    5      0f people from all over the world come to visit the
university town. It has become a famous place all     6     the world.
1.              2.              3．              4.              5.              6．

填空题

释放表单时，最后引发的事件是 ______。