But Flegal stresses the difference in death rates appear to be small between normal-weight people and overweight and mildly obese individuals.

　　The finding by Flegal and colleagues have raised new questions about the reliability(可靠性)of the so-called "body mass index" or BMI, a measurement of body fat as a ratio(比例，比率)of height to weight, that has become popular in recent years among public healthexperts to measure potential health risks.

　　But Heymsfield warns that individuals should not conclude that it's okay to put on extra kilograms, since being at a healthy weight lowers the risk for heart disease and diabetes.

　　32．Katherine Flegal feels surprised at the fact that____.

　　A. obese people have higher death rates

　　B. slightly obese people have lower death rates

　　C. obese people tend to die early

　　D. death rates have nothing to do with body weight

　　33．What do we learn from the fifth paragraph?

　　A. BMI may not be so reliable.

　　B. The study provides further evidence for BMI.

　　C. BMI tells nothing about potential health risks.

　　D. BMI has been much questioned recently.

　　34．What can we conclude from the passage'?

　　A. It's OK to put on extra weight.

　　B. It doesn't matter if you are slightly obese.

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