17．It sounds an ad from late-night TV：Follow this four-step plan and improve your memory in just 14days!But researchers have indeed found a way to improve memory function in older people．After a two-week study that involved brainteasers（腦筋急轉(zhuǎn)彎），exercise and diet changes，study participants'memories worked more efficiently．Here's the program：
Memory Training：Brainteasers，crossword puzzles and memory exercises that emphasized verbal skills throughout the day．
Healthy Diet：Five meals daily included a balanced diet rich in omega-3fats，whole grains and antioxidants．Eating frequent meals prevents dips in blood glucose，the primary energy source for the brain．
Physical Fitness：Brisk daily walks and stretching．Physical fitness has been found in other research to reduce the risk of Alzheimer's disease．
Stress Reduction：Stretching and relaxation exercises．Stress causes the body to release control，which can impair memory and has been found to shrink the memory centers in the brain．
Before-and-after brain scans showed the participants experienced on average a five percent decrease in brain metabolism in the dorsal lateral prefrontal region of the brain，which is directly linked to working memory and other cognitive functions．This suggests they were using their brains more efficiently．The subjects also performed better on a cognitive test．However，a control group that didn't follow the plan showed no significant changes．
"We've known for years that diet and exercise can help people maintain their physical health，which is a key component of healthy aging，"said Gary Small，professor of psychiatry and behavioral sciences UCLA．"But maintaining mental health is just as important．Now we have evidence which suggests that people can keep their memory by adding memory exercises and stress reduction．"
11．What is the main idea of this passage？C
A．To focus on the importance of individual health
B．To persuade the readers to do more usual exercises
C．To discuss ways for people to maintain memory
D．To prove some ads form TV can be believable
12．In paragraph 5，the underlined word"release"probably meansA．
A．send out B．prevent
C．come across D．change
13．If a personal feel seriously stressed，it can lead toB．
A．Alzheimer's disease
B．a(chǎn) bad memory
C．a(chǎn) certain decrease in brain metabolism
D．a(chǎn) lack of blood glucose
14．What would be the best title for this passage？D
A．Exercise Help to Maintain Physical Health
B．Different Ways Contribute to Healthy Aging
C．Ads Suggest Ways to Sharpen Memory
D．Study：14-Day Plan Improves Memory
15．Which of the following is NOT included in the program to improve the older people's memory？D
A．Health diet
B．Physical fitness
C．Stress reduction
D．Beneficial activities．
分析 本文為科普類文章，介紹了14天增強(qiáng)記憶的方法．研究人員真的找到了一種提高老年人記憶功能的方法．通過兩周的腦筋急轉(zhuǎn)彎、體育鍛煉和飲食調(diào)整，參與者的記憶力確有增強(qiáng)．
解答 11---15 CABDD
11．答案C．主旨大意題．根據(jù)第一段最后兩句話After a two-week study that involved brainteasers（腦筋急轉(zhuǎn)彎），exercise and diet changes，study participants'memories worked more efficiently．Here's the program可知，文章主要介紹14天改善記憶的訓(xùn)練項目．故選C．
12．答案A．詞義猜測題．release意為"釋放"，對應(yīng)A選項send out．prevent預(yù)防，阻止．come across偶遇．change改變．句意：緊張會導(dǎo)致人體釋放皮質(zhì)醇，降低記憶力，縮小記憶中樞在大腦中的比重．
13．答案B．推理判斷題．根據(jù)第五段Stress causes the body to release control，which can impair memory and has been found to shrink the memory centers in the brain可知，緊張會導(dǎo)致人體釋放皮質(zhì)醇，降低記憶力，縮小記憶中樞在大腦中的比重，從而導(dǎo)致記憶力下降．故選B．
14．答案D．主旨大意題．本文為科普類文章，介紹了14天增強(qiáng)記憶的方法及相關(guān)研究．故選D．
15．答案D．細(xì)節(jié)理解題．根據(jù)第三段Healthy Diet，排除A選項．根據(jù)第四段Physical Fitness，排除B選項．根據(jù)第五段Stress Reduction，排除C選項．故選D．
點(diǎn)評 閱讀理解解題技巧：1．迅速將整篇文章分解，理出文章結(jié)構(gòu)；2．迅速抓住文章敘述的主題；3．迅速找出各部分的中心意思，并找出表達(dá)中心意思的句子．
