C 

          Feel too old or too stupid to learn a second :

language? It may be worth peraeven(坚持).A study that tracked hundreds of Scottish people for decays gives the strongest evidence that speaking an extra language slows the mental decline that accompanies ageing. The benefits hold regardless of your IQ and even if you learn vour second language as an adult. 

          Previous studies have shown that people with disease(老年痴呆) who are fluent in two languages exhibit symptoms of the condition four or five years later than people who are(只用一种语言的) .However,it has been difficult to explain the effects of knowing multiple languages.

          To resolve the issue,Thomas Bak of the Universi  of Edinburgh,UK turned to the study,which has tracked about l,l00 people bom in 1936 in and around Edinburgh. AH were monolingual English speakers at age 11 ,when they had taken a series of (认知的)           Although the study wasn't  designed to investigate language effects,itvv provides a unique research opportunity,says Ellen Bialystok at York University m Toronto,Canada,who was the first to discover that being bilingual delays the beginning of Alzheimer 's  disease .

          853 of the participants were tracked down when they were in their early 70s. Almost 262 of them had learned;to speak at least one additional language and 65 had learned it after the age of 18. Bak gave the participants cognitive tests and compared these with the test scores :from when they were 11. Those who had learned an extra;language performed better in the cognitive tests in their 70s,indicating that the extra language itself is beneficial.                 Bialystok says the cognitive benefits seen in the;Scottish study agree with her own work on blllngua people with Alzheimer' s  disease,suggesting that thei same beneficial processes are at work:

         How could languages protect the brain? A theory is that people who speak several languages constantly :activate all the available words in each one before choosing the appropriate expression,giving them some ;:mental exercise.

9. According to the text,the mental benefits of learning a second language .

   A. may decrease while ageing

   B. can change with learners’ IQ

   C. can help learners when they ’re old

   D. are related to when one starts to learn it

10. How did Thomas Bak get his conclusion?

   A. By studying Scottish history.

   B. By watching participants’ behavior.

   C. By comparing participants’ test scores.

   D. By analyzing participants’ questionnaires.

11. What can we leam about Thomas Bak's study?

   A. It was carried out in 1936. 

   B. Its result supports Bialystok's finding.

   C. It was aimed at looking into language effects.

   D. 262 of the participants failed to speak a second language.

12. Why can learning a second language benefit the brain?

   A. It can raise speakers ’ spirits.

   B. It increases mental activities.

   C. It helps reduce mental diseases.

   D. It can activate all the physical expression.

                                 C

                             ★★★★☆

          Sixteen dollars!That's the price of a movie ticket plus tax in Los Angeles. Thanks to an Indian chemist,that amount of cash could also provide clean water for a year for a poor family in the developing world.

          Thalappil Pradeep,a chemistry professor at the Indian Institute of Technology,spent 14 years developing a water filter(滤水器) system that can. remove pollutants from India's groundwater as it is being pumped. The water purifier,which Pradeep first showed to the public in 2012,is the first filter of its kind in India. The country's federal government recently decided to place the pumps across the nation,Pradeep said. He and a team of students formed a company to keep up with the work,he added.

            The device(设备) come in two sizes and at three price levels,which include installation (安装) costs: The $16 version is for homes; a larger one that can be used at schools and office buildings is $500 (connecting a whole village costs $700 more) . The larger purifier,which stands nine feet tall,produces about 80 gallons of clean water per hour.

            Worldwide,663 million people do not have access to clean and safe water. In India,access to clean water is particularly poor. About 21  percent of illnesses in India are caused by drinking dirty water,and more than 100,000 deaths are caused by water-borne illnesses each year.

           The first of Pradeep‘s  pumps was "installed in West Bengal,a state in eastern India,in 2012. The state government took notice and installed pumps at 330 schools across the region. As a result,now about 500,000 people have access to clean water from these pumps,said Pradeep.

9. What did India’ federal government plan to do recently?

   A. To produce water purifiers itself.

   B. To set up a water purifier company.

   C. To help Pradeep continue his research.

   D. To use the water filter system nationwide.

10. What can we know about Pradeep's  device?

   A. It has three sizes and three prices.

   B. It first appeared in public in 2012.

   C. It can purify 80 gallons of dirty water per day.

   D. It is the first widely used water filter in the world.

11. What does the author want to stress by using the figures in Paragraph 4 ?

   A. People in India live a healthy life.

   B. Clean drinking water is not hard to get.

   C. The water purifier is important to India.

   D. It's hard to cure illnesses caused by drinking dirty water.

12. What is the text mainly about?

   A. A water filter system.

   B. Water problems in India.

   C. An Indian chemist's life.

   D. The cost of the water purifier.

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