阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。

　　Mama' s voice floated through the apartment a s she sang a Mexican folk song that I had heard all my life．“Hola, ” she greeted me when she came out of the bedroom．“Plea se speak to me in 　　1　　, ” I interrupted．She paid no attention and 　　2　　 speaking in Spani sh．The word s 　　3　　 me of my grandparent s and birthday partie s in Mexico, but I knew my mother' s life would be 　　4　　 if she learned to speak Engli sh．We had lived in the United State s for three year s, and she still had difficulty 　　5　　 to store owner s and my teacher s．I wa s determined that she should try．“Why won't you speak Engli sh? ” I 　　6　　．“Don't you want to be 　　7　　 to talk to people here? ” “I sabel, ” she whi spered．Mama alway s whi spered when she wa s up set with me．“What? ” I wa s not 　　8　　 with her, either．She 　　9　　 for the Engli sh word s．“Come with me to the, uh-how do you say it? Meeting．” “What kind of meeting? Where i s it? ” I 　　10　　 her, but now she refu sed to an swer．In 　　11　　, we drove acro s s town to the college, where she pulled into a brightly lit parking lot．I wa s 　　12　　．I had expected a meeting at someone' s 　　13　　-a garden club or a parent s’ group．Then I 　　14　　 a sign on a door．My mother wa s 　　15　　 night cla s se s to learn Engli sh!

　　“I don't under stand．　　16　　 you’re learning Engli sh, why won't you speak Engli sh at home? ” I a sked．“You'll learn fa ster if you 　　17　　 with me．” “I speak Engli sh here, ” she said in her thick accent．She he sitated, putting the word s together, and then went on, “I speak Spani sh at home 　　18　　 you．”

　　I 　　19　　 under stood-she spoke Spani sh at home so that I wouldn't forget the word s, song s, and 　　20　　 of Mexico．I said, “O．K．, Mama, e stabien．”

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阅读理解

　　As people continue to grow and age, our body systems(系统)continue to change．At a certain point in your life your body system will begin to weaken．Your strength may become weaker．It may become more difficult for you to see and hear．The slow change of aging causes our bodies to lose some of their ability to bounce back from disease and injury．In order to live longer, we have always tried to slow or stop this change that leads us toward the end of our lives．

　　Many factors(因素)decide your health．A good diet plays an important role．The amount and type of exercise you get is another factor．Your living condition is yet another．But scientists studying aging problem want to know：Why do people grow old?They hope that by studying the aging medical science they may be able to make the length of life longer．

　　There is nothing to be afraid of as old age comes．Many consider the later part of life to be the best time for living．Physical activity may become less, but often you get better understanding of yourself and the world．

　　What we consider old age now may only be middle-aged some day soon．Who knows, with so many advances in medical science happening so quickly, life length may one day be measured in centuries, rather than in years!

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