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问题 解答题

两种生物共同生活在一起就是共生．______．

答案

有些细菌与植物共同生活在一起，相互依赖，双方彼此有利，一旦分开，两者都要受到很大影响，甚至不能生活而死亡，这就是共生． 故答案为：×

单项选择题

医院健康促进涉及三级预防中的（）。

A.二级预防

B.三级预防

C.一、二级预防

D.二、三级预防

E.一、二、三级预防
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单项选择题

E


It was December 25. Marie, a 13-year-old Australian girl, was happy. It was Christmas and Marie’s mother was making a very special cake. She put four small coins into the cake and then baked it. The four coins were for good luck. After dinner, Marie and her family ate the cake. They found three coins in the cake and put them on the table. Where was the fourth one It was missing(找不到的), but Marie’s mother didn’t notice.
After Christmas, Marie got sick. She coughed and couldn’t speak. Marie’s parents took her to hospital. Doctors at the hospital looked her over and then said," We are sorry, but we can’t help her. "For 12 years, Marie didn’t speak. But like other common people, she grew up, she got a job, she got married. One day, when Marie was 25 years old, she got a sore throat. She began to cough. She coughed up something small and black. What was it Marie didn’t know. She took it to a hospital. A doctor at the hospital said," This is a coin!" The doctor told Marie," I think you can speak again. \

How old was Marie when she became unable to speak ( )

A．She was 12.

B．She was 13.

C．She was 25.

D．She was 27.
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