题目内容

Underwriters Laboratories issued a report last week that found 48% of consumers “feel high-tech manufacturers bring new products to market faster than people need themThere are two possible explanations. The first, obvious one is that the pace of innovation(创新)is too fast for consumers. The second, less obvious one is that, in fact, innovation is too slow. That is, the new offerings companies are pushing out the door every six months or so are me-too products or ones with just a couple of new features.(2012-12-cet4)What does the author mean by “me-too products”?

A. Products with no substantial difference.
B. Products tailored to individual users.
C. Products everyone is eager to possess.
D. Products companies compete to make.

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A. 选择偏倚
B. 信息偏倚
C. 入院率偏倚
D. 混杂偏倚

随机对照实验不具备的特征是

A. 设立了对照组
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D. 实验中运用盲法

现有新型流感疫苗,为了评价其免疫效果你准备选择的观察人群

A. 抗体水平高的人群
B. 交通不发达的山区人群
C. 预测发病率低的人群
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A. 研究方向由果到因
B. 设立了对照组
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D. 可以用于病因推断

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