题目

血红蛋白的特性是（ ）A. 易与氧结合，也易与氧分离B. 不易与氧结合，也不易与氧分离C. 易与氧结合，不易与氧分离D. 不易与氧结合，易与氧分离 答案：【答案】A【解析】试题分析：红细胞里有一种红色含铁的蛋白质，叫血红蛋白。血红蛋白的特性是：在氧含量高的地方，与氧容易结合；在氧含量低的地方，又与氧容易分离，所以红细胞的主要作用是运输氧，同时也运输一部分二氧化碳。Nick VujicicLook at the man in the picture. Do you know him? He is Nick Vujicic, a famous speaker in the world.Nick was born ( 出 生 ) in 1982 in Australia. He has no arms or legs. He only has a small foot on his left side ( 侧 ). But Nick can do a lot of things. Hecan swim, play football, and go surfing. He can use a computer. He uses his one foot to type (打字) and write.Nick has many kinds of problems (问题) in his life. But he doesn't give up ( 放弃). He tells his stories ( 故事) to encourage others. Nick has a speaking company (公司). He gives speeches (演讲) in many countries. He tells others to love themselves and dream (梦想) big.Now Nick lives in the USA. He has four kids, two boys and two girls. He has a happy family.1.Nick Vujicic uses to write.A.his handsB.his mouthC.his legsD.his foot2.What does the word “encourage” in Paragraph 3 probably mean (意思)?A.打败 B.鼓励 C.观察 D.表扬3.What does the writer want to tell us?A.Nick Vujicic can do everything.B.Nick Vujicic likes writing stories.C.Nick Vujicic loves life and doesn't give up.D.Nick Vujicic is happy and doesn't have problems