广泛的托福阅读背景知识积累，有助于阅读速度和准确率的提升。如果同学们平时能对各类文章都有所涉猎，托福阅读考试中遇到相关的话题就会有非常熟悉的感觉。本期为大家介绍的托福阅读材料是Bedtime Blues。
Never a happy topic， bed wetting is a very distressing problem for five to seven million American kids. If we can’t explain why some people like to pick on these kids, can we at least shed some light on what causes bed wetting?
At one time, people punished bed-wetters for acting badly, but today scientists believe that this condition has several physical causes. Some kids suffer from problems like infections or anatomical defects that can be easily identified and treated.
Other causes are harder to pin down. One promising area of research is on the kidney hormone ADH. We all produce more ADH hormone at night. ADH signals the kidney to slow down production. This is why we don’t go to the bathroom for eight hours at night but could never last that long between bathroom breaks during the day. Some children who wet their beds do not produce enough ADH at night. When given drugs that boost this hormone, they stop bed wetting.
Finally, some kids simply have small bladders and an undeveloped nervous system. The good news is that these kids, like most bedwetters, will grow out of it as their bodies develop and mature.
以上就是为大家整理的托福阅读材料Bedtime Blues，同学们可以积累其中的词汇及优美句式，找到文章段落的主题句，了解托福阅读的几个出题点。托福阅读训练是个长期的过程。大家如果每天做几篇阅读，坚持下来，一定会有不小的进步。前程百利祝大家都能取得理想的托福考试成绩。
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