问题
单项选择题
在高原、高空环境下，只要吸入气PO2大于60mmHg，Hb氧饱和度仍可达
A．60%～70%
B．70%～80%
C．80%～90%
D．90%以上
答案
参考答案：D
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在高原、高空环境下，只要吸入气PO2大于60mmHg，Hb氧饱和度仍可达
A．60%～70%
B．70%～80%
C．80%～90%
D．90%以上
参考答案：D
My 15-year-old brother John and I saw the coat at the same time. The thick black wool of the coat was soft, and it only 28 dollars. We looked at each other, saying , but John’s face was shining with joy. Dark woolen coats were popular with boys at that time, and could cost several hundred dollars. But this coat was much . John tried on the coat and bought it at once. John wore the coat to school the next day and came home a big smile. “How did the kids think of your coat?” I asked. “They loved it very much,” he said. I started to him “Lord (老爷) John”. During the next few weeks, a came over John. He became more polite, more thoughtful and more pleasing. He would lend his classmates his pens; he would bring his father a cup of tea when he got home; he would help a blind man the road. One day, my brother and I met a friend in the library. “Could this be John?” he asked in a great surprise. John shook hands with him, just a gentleman! What changed John? It was his own attitude. If you think you are a gentleman or a lady, you a perfect one.
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