A. pink and red

　　B. grey and black

　　C. blue and green

　　D. yellow and orange

　　58. In Costa Rica, boys and girls between seven and fourteen ______.

　　A. must go to school

　　B. study in the same school

　　C. do not have to go to school at all

　　D. can choose to stop schooling at any time

　　59. From December to February, school children in Costa Rica ______.

　　A. have lessons every day

　　B. have their examinations

　　C. help their parents pick coffee beans

　　D. help their parents decorate their houses

　　60. This passage is mainly about ______.

　　A. Christopher Columbus

　　B. Costa Rica

　　C. some products from Costa Rica

　　D. the education of Costa Rica

　　B

　　Christian Eijkman, a Dutch doctor, left the Netherlands for the island of Java. Many people on the island had a disease called beri? He was going there to try and find a cure.

　　At first, Eijkman thought some kind of germ (细菌) caused beri? He raised some chickens. He didn’t eat them, but made experiments on them. The local people were quite surprised at that. One day he noticed that his chickens became sick when they were fed the food most Javanese ate — refined white rice (精炼米). When he fed them with unrefined rice, also known as brown rice, they recovered. Eijkman realized that he had made an important discovery — that some things in food could prevent disease. These things were named vitamins (维生素). The Javanese were not getting enough vitamins because they had actually removed the part that contains vitamins. Later, other diseases were also found to be caused by the lack of vitamins in a person’s food.

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