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阅读理解。 Letters to the next president Dear Mr. President: I would like to personally thank you for your time and concern for our great country. I would like to take a few minutes to address a few concerns that I have with the United States. First of all, I would like to address the war. In my opinion, we should have never been involved with Iraq to the extent that we are now. I believe we should pull our troops out. However, I think there should be a time table that we follow but the time table should not be released because the enemy does not need to know when we are going to pull out. Also, the war takes out a ton of our money, which leads me to my next issue. The economy right now, in the opinion of many Americans is the biggest issue with which we are facing right now. No one can predict what will happen one day or the next. The obvious thing to do is to put 700 billion dollars in the economy, but that bill failed and was rejected by the House of Representatives (众议院). Instead of putting 700 billion dollars in, I think the money should be equally distributed among Americans to pay off their debts. I'm not sure if this would work, but I think it is a positive alternative we could take. My final issue I would like to call to your attention is teacher's salaries. The high school students of today are America's future. In a way, America's future depends greatly on the high school teachers of America. Saying this, it is sad that teacher's salaries are where they are. While teachers are working harder and harder every day to teach high school students, CEO's of big companies that are driving our countries economy into the ground are getting bonuses. I'm not saying that teacher's salaries should be the same of CEO's of companies, but I do strongly believe that action should be taken to increase the salaries of teachers because they have one of the most important jobs in America-preparing our country for the future. Once again, thank you for your time and your effort you put in to making this great country a better place. Sincerely, Walker 1. What's the author's attitude the Iraq War? [     ] A. Supportive B. Objective C. Negative D. Positive 2. What's true about the time of pulling the troops out? [     ] A. We should pull the troops out without delay. B. There is no need to have a time table to follow. C. The public has the fight to know the time table. D. We should keep the time secret from the enemy. 3. According to the author, the 700 billion dollars ______. [     ] A. is the biggest issue with which we are facing right now B. has been accepted by the House of Representatives C. should be equally shared among Americans D. should be put in the economy 4. When talking about high school teachers, the author thinks that ______. [     ] A. the teachers' salaries are not high enough B. teacher's salaries should be as high as CEO's C. the teachers work harder than CEO's of companies D. teaching is more important than any other job in America 5. Which of the topics is NOT included in the letter? [     ] A. Election B. International affair C. Finance D. Education
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【单选题】理想运算放大器工作在线性区,虚短成立的原因是( )。
A.
开环电压放大倍数无穷大
B.
差模输入电阻无穷大
C.
输出电阻为 0
D.
其他选项都不正确
【多选题】以下说法正确的是
A.
队列研究属于观察性研究
B.
队列研究是 “由果推因”的研究方法
C.
在研究吸烟与肺癌的关系时,可以将研究对象随机分配入吸烟组和不吸烟组,随机对照试验可以用于探讨两者之间的因果关系
D.
在一项队列研究中,被观察人群的暴露与否不是随机分配形成
E.
在队列研究中,如果结局测量者知道研究对象的暴露情况,则会关心暴露组的结局发生与否,使得暴露组一些原本可能忽略的结局或早期结局被检查出来,从而产生偏倚
F.
随访时间的长短不会影响到证据的真实性,研究对象失访才会影响到证据的真实性
【单选题】理想运算放大器工作在线性区,虚短成立的原因是( )。
A.
开环电压放大倍数无穷大
B.
差模输入电阻无穷大
C.
输出电阻为 0
D.
以上都不对
【单选题】理想运算放大器工作在线性区,虚短成立的原因是( )。
A.
开环电压放大倍数无穷大
B.
差模输入电阻无穷大
C.
输出电阻为 0
D.
共模抑制比无穷大
【单选题】不属于队列研究中偏倚的是:
A.
入院率偏倚
B.
选择偏倚
C.
信息偏倚
D.
失访偏倚
E.
混杂偏倚
【单选题】女性生殖系统自然防御机制最重要的是( )
A.
两侧大阴唇自然合拢
B.
黏液栓塞子宫颈管
C.
阴道前后壁紧贴
D.
阴道自净作用
E.
子宫内膜周期性剥脱
【单选题】理想运算放大器工作在线性区,虚短成立的原因是( )。
A.
虚短成立,虚断不成立 开环电压放大倍数无穷大
B.
差模输入电阻无穷大
C.
输出电阻为 0
D.
共模抑制比无穷大
【单选题】理想运算放大器工作在线性区,虚短路成立的原因是( )。
A.
开环电压放大倍数无穷大
B.
差模输入电阻无穷大
C.
输出电阻为 0
D.
共模抑制比无穷大
【单选题】队列研究中的失访偏倚,属于
A.
选择偏倚
B.
信息偏倚
C.
测量偏倚
D.
混杂偏倚
E.
偶然偏倚
【单选题】过食冷饮会引起儿童( )
A.
胃肠道内温度骤然下降
B.
局部血液循环减缓
C.
影响对食物中营养物质的吸收和消化
D.
以上都是
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