正确答案: C

排除法

题目：通过双盲法来控制额外变量的方法属于

解析：C

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学习资料的答案和解析：

[单选题]Text 2Over the past century, all kinds of unfairness and discrimination have been condemned or made illegal. But one insidious form. continues to thrive: alphabetism. This, for those as yet unaware of such a disadvantage, refers to discrimination against those whose surnames begin with a letter in the lower half of the alphabet.

It has long been known that a taxi firm called AAAA cars has a big advantage over Zodiac cars when customers thumb through their phone directories. Less well known is the advantage that Adam Abbott has in life over Zoë Zysman. English names are fairly evenly spread between the halves of the alphabet. Yet a suspiciously large number of top people have surnames beginning with letters between A and K. Thus the American president and vice-president have surnames starting with B and C respectively; and 26 of George Bush’s predecessors (including his father) had surnames in the first half of the alphabet against just 16 in the second half. Even more striking, six of the seven heads of government of the G7 rich countries are alphabetically advantaged (Berlusconi, Blair, Bush, Chirac, Chrétien and Koizumi). The world’s three top central bankers (Greenspan, Duisenberg and Hayami) are all close to the top of the alphabet, even if one of them really uses Japanese characters. As are the world’s five richest men (Gates, Buffett, Allen, Ellison and Albrecht). Can this merely be coincidence? One theory, dreamt up in all the spare time enjoyed by the alphabetically disadvantaged, is that the rot sets in early. At the start of the first year in infant school, teachers seat pupils alphabetically from the front, to make it easier to remember their names. So short-sighted Zysman junior gets stuck in the back row, and is rarely asked the improving questions posed by those insensitive teachers. At the time the alphabetically disadvantaged may think they have had a lucky escape. Yet the result may be worse qualifications, because they get less individual attention, as well as less confidence in speaking publicly. The humiliation continues. At university graduation ceremonies, the ABCs proudly get their awards first; by the time they reach the Zysmans most people are literally having a ZZZ. Shortlists for job interviews, election ballot papers, lists of conference speakers and attendees: all tend to be drawn up alphabetically, and their recipients lose interest as they plough through them. 第46题：What does the author intend to illustrate with AAA A cars and Zodiac cars?

kind of overlooked inequality.

[单选题]以经济建设为中心是

兴国之要 D．我们党和国家兴旺发达、长治久安的根本要求

解析：CD

[多选题]个人品德是通过个人自觉的道德修养和社会道德教育所形成的稳定的心理状态和行为习惯，它表现为个人

对道德要求的强烈认同

对道德情感的充分表达

对社会道德规范的执著践履

解析：ABC

[多选题]一般说来，游击战争是个战术问题。但是，在抗日战争中，游击战争具有战略地位，是因为它

主要是在外线单独作战，而不是在内线配合正规军作战

是大规模的，而不是小规模的

解析：一般说来，游击战争是个战术问题。但是，在抗日战争中，游击战争具有战略地位，是因为它，主要是在外线单独作战，而不是在内线配合正规军作战，是大规模的防御战。因此，本题正确答案是选项AC。