Question

11．Although they are an inexpensive supplier of vitamins，minerals，and high-quality protein，eggs also contain a high level of blood cholesterol（膽固醇），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 本文屬于說明文閱讀，作者通過這篇文章主要向我們描述了雞蛋與膽固醇之間的關(guān)系，雞蛋含有較高膽固醇，但是適當(dāng)?shù)某苑ㄒ部梢越档湍懝檀�；雞蛋生產(chǎn)商為提高銷量生產(chǎn)了據(jù)說不會增加膽固醇的新型雞蛋，但還有待科學(xué)的驗(yàn)證．

解答 46．B．細(xì)節(jié)理解題．根據(jù)文章第一段"eggs also contain a high level of blood cholesterol（膽固醇），one of the major causes of heart disease"可知膽固醇會引發(fā)心臟病；故選B．
47．D．細(xì)節(jié)理解題．根據(jù)文章第一段"One egg yolk，in fact，contains a little more than two-thirds of the suggested daily cholesterol limit"，可知雞蛋膽固醇高，因此銷量下降；故選D．
48．B．細(xì)節(jié)理解題．根據(jù)文章第二段"They have the advantage of having lower cholesterol rates，and they can be scrambled or used in baking"可知雞蛋適合烘烤著吃；故選B．
49．C．主旨大意題．通讀全文，可知文章主要在介紹雞蛋與膽固醇之間的關(guān)系，雞蛋含有較高膽固醇，但是適當(dāng)?shù)某苑ㄒ部梢越档湍懝檀�；故選C．
50．C．推理判斷題．通讀全文，可知雞蛋含有較高膽固醇，會影響人體內(nèi)膽固醇含量，但是并不會決定膽固醇含量；故選C．

點(diǎn)評 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力，做細(xì)節(jié)理解題時一定要找到文章中的原句，和題干進(jìn)行比較，再做出正確的選擇．在做推理判斷題不要以個人的主觀想象代替文章的事實(shí)，要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷．