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Results of the experiment indicated that ______.
A．patients treated with venom were stung less frequently
B．immunotherapy was effective for all patients
C．immunization took place in 7 out of 12 patients
D．the traditional treatment was as effective as the placebo
答案
更多“Results of the experiment indicated that ______.A．patients treated with venom were stung l”相关的问题
第1题
Which of the following is NOT mentioned as a requirement？
A．Good appearance
B．Previous experience
C．A master's degree
D．Good speaking and writing skills
第2题
The word "tricks" at the end of Paragraph 2 is closest in meaning to.
A．"experience".
B．"cheating".
C．"skills".
D．"training".
第3题
As indicated in the passage, the water problem ______.
A．has been exaggerated by some experts in the field
B．is underestimated by government organizations at different levels
C．poses a challenge to the technology of building reservoirs
D．is already serious in certain parts of the world
第4题
本题利用WAGE1.RAW中的数据。
(i)使用OLS估计方程
(iv)exper取什么值时，工作经历的增加实际上会降低预期的log(wage)。样本中有多少人具有比该取值更长的工作经历？
第5题
What is the relationship between paragraph 4 and paragraph 5？
A. Cause and effect.
B. Experiment and result.
C. Problem and solution.
D. Topic and comment.
第6题
He was surprised that the other participants
A．were there for reasons like his.
B．were experienced climbers.
C．were in better condition than him.
第7题
然后将1og(wage对进行回归。将系数与在log(wage)对educ、exper和tenure的回归中educ的系数相比较。
第8题
The interview mainly focuses on
A．Amy"s university experience in Harvard.
B．Amy"s life experience and her new book.
C．Amy"s ideas on immigration into America.
D．Amy"s general knowledge on international law.
第9题
Part A
You are required to write an Address (致辞) with about 100 words to a foreign expert at the farewell meeting. The following should be included in your writing.
1. Name: Steven Black
2. Time: for three years
3. Job: help to build the Olympic Village
4. Reason: go back to America for another great job
第10题
利用WAGEPAN中数据。
(i)利用混合最小二乘法(pooledOLS)估计一个log(ag为被解释变量的方程。以educ，black，exper，married，union以及一系列时间虚拟变量(以1980年为基年)为可解释变量，解释及讨论变量married和union的系数。
(ii)解释为什么通常(i)中标准误总是偏小。算出关于married和union两个变量对自相关和异方差一稳健的标准误。
(iii)现在对变量lwage，exper，married和union进行一阶差分。(不随时间改变的变量educ，black和hisp被排除在这个估计之外，exper也是，因为它总是随着年份增加。)注意排除首年即1980年的一阶差分，因为不存在更早的年份。
(iv)就
作回归分析，确保包括一个常数项和一个从1982年到1987年的时间虚拟变量。算出Δmarried和Δunion的系数和标准误。
(v)对比婚姻状况和工会保费的估计水平及其一阶差分估计，并作相应评论。
第11题
A．Because it results in a declining market for manufactured goods.
B．Because it results m rising prices.
C．Because it results in rising demands.
D．Because it results in pressure on housing.
