Question

11．Although they are an inexpensive supplier of vitamins，minerals，and high-quality protein，eggs also contain a high level of blood cholesterol（胆固醇），one of the major causes of heart disease．One egg yolk，in fact，contains a little more than two-thirds of the suggested daily cholesterol limit．
    This knowledge has caused egg sales to drop in recent years，which in turn has brought about the development of several alternatives to eating regular eggs．One alternative is to eat substitute eggs．These egg substitutes are not real eggs，but they look somewhat like eggs when they are cooked．They have the advantage of having lower cholesterol rates，and they can be scrambled or used in baking．One disadvantage，however，is that they are not good for frying，poaching，or boiling．A second alternative to regular eggs is a new type of eggs，sometimes called"designer''eggs．These eggs are  produced by hens that are fed low-fat diets consisting of ingredients such as canola oil，flax，and rice bran．In spite of their diets，however，these hens produce eggs that contain  the same amount of cholesterol as regular eggs．Yet，producers of these eggs claim that eating their eggs will not raise the blood cholesterol in humans．
    Egg producers claim that their product has been described unfairly．They use scientific studies to back up their claim．And  in tact  studies on the relationship between eggs and human cholesterol levels have brought mixed results．It may be that it is not the type of egg that is the main determinant of cholesterol but the person who is eating the eggs．Some people may be more sensitive to cholesterol from food than other people．In fact，there is evidence that certain dietary fats stimulate the body's production of blood cholesterol．Consequently，while it still makes sense to limit one's intake of eggs，even designer eggs，it seems that doing this without regulating dietary fat will probably not help reduce the blood cholesterol level．
46．According to this passage，which of the following is a cause of heart disease？B
A．High-quality protein   
B．Cholesterol
C．Canola oil            
D．Minerals
47．The main cause of the recent drop in egg sales isD．
A．the production of substitute eggs and designer eggs
B．the changes in hen's diet
C．the increasing price
D．People's knowledge of the high level of blood cholesterol in eggs
48．Which is the best way to cook substitute eggs？B
A．Boiling．    B．Baking．    C．Frying．D．Poaching．
49．What's the main purpose of this passage？C
A．To advertise for substitute eggs．
B．To warn people of the danger of heart disease by eating eggs．
C．To inform people of the relationship between eggs and cholesterol．
D．To tell people that fat intake is more dangerous than egg intake．
50．Which of the following statements is NOT true？C
A．It has been proved that some dietary fats stimulate the body's production of blood cholesterol．
B．Some people are insensitive to cholesterol from food．
C．It is the type of egg that determines the level of cholesterol in one's body．
D．Controlling one's intake of eggs and dietary fat is likely to reduce blood cholesterol．

Answer 1

分析 本文属于说明文阅读，作者通过这篇文章主要向我们描述了鸡蛋与胆固醇之间的关系，鸡蛋含有较高胆固醇，但是适当的吃法也可以降低胆固醇；鸡蛋生产商为提高销量生产了据说不会增加胆固醇的新型鸡蛋，但还有待科学的验证．

解答 46．B．细节理解题．根据文章第一段"eggs also contain a high level of blood cholesterol（胆固醇），one of the major causes of heart disease"可知胆固醇会引发心脏病；故选B．
47．D．细节理解题．根据文章第一段"One egg yolk，in fact，contains a little more than two-thirds of the suggested daily cholesterol limit"，可知鸡蛋胆固醇高，因此销量下降；故选D．
48．B．细节理解题．根据文章第二段"They have the advantage of having lower cholesterol rates，and they can be scrambled or used in baking"可知鸡蛋适合烘烤着吃；故选B．
49．C．主旨大意题．通读全文，可知文章主要在介绍鸡蛋与胆固醇之间的关系，鸡蛋含有较高胆固醇，但是适当的吃法也可以降低胆固醇；故选C．
50．C．推理判断题．通读全文，可知鸡蛋含有较高胆固醇，会影响人体内胆固醇含量，但是并不会决定胆固醇含量；故选C．

点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．