在研究职业性疾病时，因健康工人效应造成的偏倚称为（）
A.测量偏倚
B.检出症候偏倚
C.易感性偏倚
D.奈曼偏倚
E.信息偏倚
参考答案：C
解析：当对某一毒物或特定的工作环境与工人健康的关系研究时，分析结果可能暴露该因素的工人死亡率或相关疾病的发病率反而比一般人群低，原因是此类工人由于工作需要其本来的健康水平就比一般人群高，对暴露因素的耐受性强而易感性低，所以其导致的偏倚是易感性偏倚，是选择偏倚的一种，再用某些特定人群做研究对象时要注意有无此偏倚。选C。
. Ⅴ.任务型阅读（10分） Packaging is an important form of advertising. A package can sometimes motivate(促动) someone to buy a product. For example, a small child might ask for a breakfast food that comes in a box with a picture of a TV character. The child is more interested in the picture than in breakfast food. Pictures for children to color or cut out, games printed on a package, or a small gift inside a box also motivate many children to buy products or to ask their parents to buy for them. Some packages suggest that a buyer will get something for nothing. Food products sold in reusable containers are examples of this. Although a similar product in a plain container might cost less，people often prefer to buy the product in a reusable glass or dish, because they believe the container is free. However, the cost of the container is added to the cost of the product. The size of a package also motivates a buyer. Maybe the package had “Economy Size” or “Family Size” printed on it. This suggests that the larger size has the largest amount of product for the least money. But that is not always true. To find it out, a buyer has to know how the product is sold and the price of the basic unit. The information on the package should provide some answers. But the important thing for any buyer to remember is that a package is often an advertisement. The words and pictures do not tell the whole story. Only the product inside can do that. Title: 71. _________
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