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问题 单项选择题 A1型题

在直线回归分析中，如果算得回归系数b>0，可以认为β（）

A.大于0

B.小于0

C.等于0

D.不等于0

E.还需进一步检验确定

答案

参考答案：E

解析：

在直线回归分析中，计算得出的b是样本回归系数，即使b≠0，总体回归系数β可能等于0，也可能不等于0，需要进一步进行统计检验，所以答案为E。

材料题

美国《新闻周刊》最新一期封面文章发表著名学者法力德．扎卡里亚的文章，文章称当今世界已进入后美国时代。阅读摘自本文的材料，回答问题：    

材料一 我们真正经历着现代历史上第三次重大的力量转变：第一次是15世纪前后以欧洲为代表的西方世界的崛起。第二次是19世纪末美国的崛起，第三次是最近二十年开始的美国之外的世界崛起。

（1）15世纪前后到19世纪中叶，欧洲为代表的西方世界崛起，试从政治、经济、思想方面说明西方世界是如何崛起的？

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（2）“最近二十年开始的的美国之外的世界崛起”表现在哪些方面？

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材料二 全球发展最直接的结果就是新经济强国的出现，而中国和印度的崛起，是这个后美国时代最直白的表现。

（3）许多“新经济强国的出现”体现了当今世界政治格局的什么趋势？这一趋势的实质？

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材料三 美国人现在很郁闷。4月，一项新的民意调查表明，81%的美国人认为这个国家走的是“错误路线”。美国人确实有理由悲观，这包括金融领域的恐慌，萧条阴影、看不到头的伊拉克战争、不断攀升的失业人数，还有愈演愈烈的恐怖威胁。

（4）你认为材料三的观点吗？说明你的理由。

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单项选择题

What’s your earliest childhood memory Can you remember learning to walk Or talk The first time you heard thunder or watched a television program Adults seldom (1) events much earlier than the year or so before entering school, (2) children younger than three or four (3) retain any specific, personal experiences.

A variety of explanations have been (4) by psychologists for this "childhood amnesia". One argues that the hippo-campus, the region of the brain which is (5) for forming memories, does not mature until about the age of two. But the most popular theory (6) that, since adults don’t think like children, they cannot (7) childhood memories. Adults think in words, and their life memories are like stories or (8) one event follows (9) as in a novel or film. But when they search through their mental (10) for early childhood memories to add to this verbal life story, they don’t find any that fit the (11) It’s like trying to find a Chinese word in an English dictionary.

Now psychologist Annette Simms of the New York State University offers a new (12) for childhood amnesia. She argues that there simply aren’t any early childhood memories to (13) . According to Dr. Simms, children need to learn to use someone else’s spoken description of their personal (14) in order to turn their own short-term, quickly forgotten (15) of them into long term memories. In other (16) , children have to talk about their experiences and hear others talk about (17) — Mother talking about the afternoon (18) looking for seashells at the beach or Dad asking them about their day at Ocean Park. Without this (19) reinforcement, says Dr. Simms, children cannot form (20) memories of their personal experiences.

5（）

A.responsible

B.suitable

C.favorable

D.available
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