4．People are overweight for many reasons，the most important one of which is that they eat the wrong foods，get the wrong types of calories per meal，and they also eat meals at the wrong time each day．Food is more powerful than any weight loss pill，because the food that you eat can either make you thin or fat．This is true because your body is like an engine，and it only needs certain foods at certain intervals（間隔）each day．
Low-calorie Diets Do Not Work
The reason people cannot lose weight by starving themselves is that their metabolism（新陳代謝）will detect any major drop in calories and it will then adjust（調(diào)整）itself by burning fewer calories each day．That is the reason why you can eat 1，000 calories per day and not lose any weight，while your friends can eat 2，500 calories per day and not gain any weight．
Low-fat Diets Do Not Work
Many people in today's society are buying mostly low-fat or non-fat food at the grocery store．Everybody knows how much fat is inside the food they buy．However，people are getting fatter than ever before by doing this．They are not losing weight by changing to this low-fat lifestyle．
Losing weight has nothing to do with these things．One of the most important things you can do to control your weight is to eat the proper foods，such as fruit and vegetables，eat them at the right time，and exercise every day．If people make this a habit，they will lose weight．
29．What is the main reason why people are overweight according to the author？A
A．They eat the wrong foods at the wrong time．
B．They eat food with lots of calories．
C．They don't take any weight loss pills．
D．They burn many calories every day．
30．The article is written in order toB．
A．tell readers not to buy low-fat or non-fat food
B．tell readers how to lose weight
C．tell readers about an important scientific discovery
D．call on people to lose weight and stay healthy
31．To realize the aim of your weight loss plan，you shouldD．
a．do exercise every day b．eat meals at the right time
c．eat fruits and vegetables d．eat low-fat or sweet food
e．eat the proper foods at each meal
A．a(chǎn)，b，c，d
B．a(chǎn)，b，d，e
C．a(chǎn)，c，d，e
D．a(chǎn)，b，c，e．
分析 本文講述了人們超重的原因以及如何減肥，應(yīng)當(dāng)多做運(yùn)動并且在正確的時(shí)間點(diǎn)吃飯、多吃蔬菜和水果，而且每餐都要吃適當(dāng)?shù)氖澄铮?/p>
解答 ABD
29．A 考查細(xì)節(jié)理解．根據(jù)"People are overweight for many reasons，the most important one of which is that they eat the wrong foods，get the wrong types of calories per meal，and they also eat meals at the wrong time each day"可知，人們超重的主要原因是他們在錯誤的時(shí)間吃錯了食物．故選A．
30．B 考查作者意圖．根據(jù)文章內(nèi)容"If people make this a habit，they will lose weight"可知，作者是想告訴讀者如何減肥．故選B．
31．D 考查細(xì)節(jié)理解．根據(jù)文章內(nèi)容可知，為了實(shí)現(xiàn)減肥計(jì)劃，我們應(yīng)當(dāng)多做運(yùn)動、在正確的時(shí)間點(diǎn)吃飯、多吃蔬菜和水果、每餐都要吃適當(dāng)?shù)氖澄铮蔬xD．
點(diǎn)評 閱讀理解考察學(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(shí)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(gè)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．
