下列哪一项论述是正确的？（） A.将已知混杂因素进行配比称匹配_爱下问搜题

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问题单项选择题

下列哪一项论述是正确的？（）

A.将已知混杂因素进行配比称匹配过头

B.历史性队列性研究是由果推因的研究

C.随机误差可以避免

D.病例对照研究是从因到果的研究

E.暴露是指曾经接触某研究因素或具备某种特征

答案

参考答案：E

填空题

电话主要部分是话筒和听筒，话筒的作用是把声信号转变成____________，听筒的作用是把_________转变成声信号。

完形填空

It was a cold winter day that Sunday. The parking lot to the 1 was filling up quickly. I noticed, as I got out of my car, fellow church members were 2 among themselves as they walked in the church. As I got 3__, I saw a man leaning up against the wall outside the church. He was almost lying down 4 he was asleep. His hat was 5 down so you could not see his face. He wore shoes that looked 30 years old, too 6 for his feet, with holes all over them and his toes 7 out. I guessed this man was 8 and asleep, so I walked on 9 through the doors of the church. We all talked for a few minutes, and someone 10 the man lying outside. People whispered but no one took 11 to ask him to come in, 12 me. A few moments later church began. We were all waiting for the Preacher (牧师) to take his 13 and to give us the Word, _14 the doors to the church opened. In 15 the man walking down the church with his head down. People gasped（喘息）and whispered and made _16 . He made his way down the church and up onto the pulpit (讲坛) where he took off his hat and coat. My heart 17 .
There stood our preacher… he was the “homeless man”. The preacher took his Bible (圣经) and 18 it on his stand.
“ 19 , I don't think I have to tell you what I am preaching about today. If you ＿20＿ people by their appearance, you have no time to love them.”

A．even though