3．Let's face it．No one drinks diet sodas for the taste．People drink diet sodas in the hope that it will help them lose weight or at least keep them from gaining it．Yet it seems to have exactly the opposite effect，according to a new study．
Researchers from the University of Texas said those who drank two or more diet sodas a day had waist size increases that were six times greater than those who didn't drink diet sodas．"What we saw was that the more diet sodas a person drank，the more weight they were likely to gain，"said Sharon Fowler．
The study was based on data from 474 participants in a large，ongoing research project，where the participants were followed for nearly 10 years．
While the findings are surprising，they also offer some explanations．
Nutrition expert，Melanie Rogers，who works with overweight patients in New York，has found that when patients are switched from regular to diet sodas，they don't lose weight at all．"We weren't seeing weight loss necessarily，and that was confusing to us，"said Rogers．
So why would diet soda cause weight gain？No one knows for sure yet，but it could be that people think they can eat more if they drink diet sodas，and so over-compensate（彌補(bǔ)） for the missing calories．
A related study found some sweeteners （甜味劑） raised blood sugar levels in some mice．"Data from this and other potential studies suggest that the promotion of diet sodas and artificial sweeteners may be risky，"said Helen P．Hazuda，professor at School of Medicine of the University of Texas．"They may be free of calories，but not of consequences．"

25．People drink diet sodas toC．
A．enjoy its taste       
B．stay in fashion
C．a(chǎn)chieve weight loss  
 D．gain more energy
26．We can learn from the passage thatB．
A．regular sodas make people lose more weight
B．diet soda drinkers tend to eat more food
C．diet sodas do help reduce calories
D．most blood diseases come from diet sodas
27．The underlined word"They"in the last paragraph probably refers to"B"．
A．sweeteners
B．diet sodas and artificial sweeteners
C．sodas
D．diet soda drinkers and sweetener takers．

分析 本文是科教類文章，主要講述了人們?yōu)榱藴p肥而喝蘇打水，可是最新的研究卻表明：喝蘇打水不僅不能讓人減肥，反而可能讓人更胖，并分析了原因．

解答 25．C．細(xì)節(jié)理解題．根據(jù)第一段中的"Peopledrink diet sodas in the hope that it will help them lose weight…"可知，人們喝蘇打水是為了減輕體重，故選C．
26．B．推理判斷題．根據(jù)倒數(shù)第二段中的"…they can eat more if they drink diet sodas…"可知，如果他們喝蘇打水，人們認(rèn)為他們可以吃得更多，所以喝蘇打水的人傾向于吃更多的食物．故選B． 
27．B．詞義猜測題．此處是承接上一句中的內(nèi)容，可知They 指代前面提及的dietsodas and artificial sweeteners．（蘇打水和人造甜味劑）．故選B．

點(diǎn)評 本文是科教類閱讀理解．做這類題材閱讀理解時要求考生對文章通讀一遍，做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進(jìn)行仔細(xì)分析，結(jié)合選項(xiàng)選出正確答案．推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案，切忌胡亂猜測，一定要做到有理有據(jù)

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