The first time I remember noticing the crossing guard was when he waved to me as I drove my son to school. He 　1  me with a puzzle-all because he waved to me like someone does　2　seeing a close friend. A big  　3　 smile accompanied his wave. For the next few days I tried to 　4　his face to see if I knew him. I didn’t. Perhaps he had 　5　  me for someone else. By the time I contented myself with the  　6　 that he and I were strangers, we were greeting each other warmly every morning like old friends.

Then one day the　7　 was solved. As I　8　 the school he was standing in the middle of the road　9　 his stop sign. I was in line behind four cars.　10　 the kids had reached the safety of the sidewalk, he lowered his sign and let the cars 　11　.To the first he waved and

　12　in just the same way he had done to me over the last few days. The kids already had the window down and were happily waving their reply. The second car got the same 　13　 from the crossing guard, and the driver, a stiff-looking(表情刻板的) businessman, gave a brief, almost

　14　 wave back. Each following car of kids on their way to school　15　 more heartily.

Every morning I continued to watch the map 　16　. So far I haven’t seen anyone 　17　 to wave back. I find it interesting that one person can make such a(n) 　18　to so many people’s lives by doing one simple thing like waving and smiling warmly. His　19　 armed the start of my day. With a friendly wave and smiling face he had changed the 　20　 of the whole neighborhood.

1. A. hit               B. disappointed               C. presented           D. bored

2. A. on               B. from                     C. during              D. about

3. A. false             B. shy                     C. apologetic           D. bright

4. A .research          B. study                    C. recognize           D. explore

5. A. praised           B. blamed                   C. mistaken            D. respected

6. A. conclusion        B. description               C. evaluation           D. introduction

7. A. argument          B. disagreement              C. mystery            D. task

8. A. visited            B .approached              C. passed             D. left

9. A. drawing back       B. putting on                C. handing in          D. holding out

10. A. Once           B. Before                   C. Unless             D. While

11. A. in              B. through                 C .out                 D. down

12. A. cried            B. cheered                 C. smiled                D. gestured

13. A. idea             B. reply                    C. notice            D. greeting

14. A. awkward        B. angry                    C. elegant             D. patient

15. A. came            B. responded               C. hurried             D. appeared

16. A. surprise         B. frustration               C. interest               D. doubt

17. A. fail             B. try                     C. wish                 D. bother

18. A. offer           B. sacrifice                  C. promise            D. difference

19. A. effectiveness     B. cheerfulness             C. carefulness        D. seriousness

20. A. trends         B. observations              C. regulations          D. feelings

　　A German study suggests that people who were too optimistic about their future actually faced greater risk of disability or death within 10 years than those pessimists who expected their future to be worse.

　　The paper, published this March in Psychology and Aging, examined health and welfare surveys from roughly 40,000 Germans between ages 18 and 96. The surveys were conducted every year from 1993 to 2003.

　　Survey respondents (受访者) were asked to estimate their present and future life satisfaction on a scale of 0 to 10, among other questions.

　　The researchers found that young adults (age 18 to 39) routinely overestimated their future life satisfaction, while middle-aged adults (age 40 to 64) more accurately predicted how they would feel in the future. Adults of 65 and older, however, were far more likely to underestimate their future life satisfaction. Not only did they feel more satisfied than they thought they would, the older pessimists seemed to suffer a lower ratio (比率) of disability and death for the study period.

　　“We observed that being too optimistic in predicting a better future than actually observed was associated with a greater risk of disability and a greater risk of death within the following decade,” wrote Frieder R. Lang, a professor at the University of Erlangen-Nuremberg.

　　Lang and his colleagues believed that people who were pessimistic about their future may be more careful about their actions than people who expected a rosy future.

　　“Seeing a dark future may encourage positive evaluations of the actual self and may contribute to taking improved precautions (预防措施),” the authors wrote.

　　Surprisingly, compared with those in poor health or who had low incomes, respondents who enjoyed good health or income were associated with expecting a greater decline. Also, the researchers said that higher income was related to a greater risk of disability.

　　T  Pessimism gurantees chances of survival.he authors of the study noted that there were limitations to their conclusions. Illness, medical treatment and personal loss could also have driven health outcomes.

　　However, the researchers said a pattern was clear. “We found that from early to late adulthood, individuals adapt their expectations of future life satisfaction from optimistic, to accurate, to pessimistic,” the authors concluded.

　　67. According to the study, who made the most accurate prediction of their future life satisfaction?

　　A. Optimistic adults.

　　B. Middle-aged adults.

　　C. Adults in poor health.

　　D. Adults of lower income.

　　68. Pessimism may be positive in some way because it causes people ______.

　　A. to fully enjoy their present life

　　B. to estimate their contribution accurately

　　C. to take measures against potential risks

　　D. to value health more highly than wealth

　　69. How do people of higher income see their future?

　　A. They will earn less money.

　　B. They will become pessimistic.

　　C. They will suffer mental illness.

　　D. They will have less time to enjoy life.

　　70. What is the clear conclusion of the study?

　　A. Pessimism guarantees chances of survival.

　　B. Good financial condition leads to good health.

　　C. Medical treatment determines health outcomes.

　　D. Expectations of future life satisfaction decline with age.

　　In 1931, it was discovered that some unknown substance present only in certain foods was necessary for good health. This substance was what is now called “Vitamin A”.

　　Vitamin A's biggest job is to keep the eyes going. Without it, people and animals get “night blindness” and eye problems. Lack of Vitamin A for a long time can even cause total blindness, particularly among children. This had a chance to be tested in Denmark during World Was I. Because of food shortage, many children had to eat man-made butter and skim milk（脱脂奶）, which contains no Vitamin A. Soon, they developed eye diseases. It was after they were given real butter and whole milk that they had no eye problems.

　　After Vitamin A was discovered, it took more than thirty years of experiments for scientists to be able to get a small amount of pure Vitamin A. Vitamin A is manufactured and is used successfully to treat a number of diseases. You can easily get enough Vitamin A by eating a variety of food. Good sources of Vitamin A are liver（肝脏） from some animals and dairy products such as milk and cream. Not only many vegetables contain carotene（胡萝卜素）, from which your liver can make its own Vitamin A, some fruits also provide carotene which helps your liver to supply Vitamin A. As long as you are getting Vitamin A from food you won't need to take any extra in the form of liquid or pills.

(1)According to the passage, if Vitamin A is not provided enough, which of the following are likely to be affected most se riously?

[　　]

(2) Vitamin A is a very. important substance mainly because it _______.

[　　]

A．is hard to made

B．helps to keep one's eyes healthy

C．can make butter more delicious

D．can not be produced in large quantity

(3) What made the children in Denmark get eye diseases during World War I?

[　　]

A．The war they experienced.

B．Their poor housing conditions.

C．The experiments on food.

D．The lack of Vitamin A in their food.

(4) According to the text, the following are all good sources of Vitamin A except _______.

[　　]

(5) Which of the following could be the best title of the passage?

[　　]