下列说法中，正确的是( )。
A．权重确定和因素选择使用的数学方法基本不同。权重是一个因素对土地质量影响程度的体现
B．定级单元是评定和划分土地的基本空间单位，其内部土地特性和区位条件有很大差异
C．按照规定方法划定的土地定级单元，是一个相对均匀地域，它是各定级因素分值计算的基础，也是土地级别划分的基础空间单元，在两者之间起着纽带作用
D．土地质量是土地级别的综合反映
参考答案：C
When I was fifteen, I announced to my English class that I was going to write my own books. Half the students smiled unkindly, 36 nearly fell out of their chairs laughing. “Don’t be 37 , only geniuses can become writers,” the English teacher said, “And you are getting a D this term.” I was so ashamed I burst into 38 . That night I wrote a short sad poem about broken dreams and mailed it to the newspaper. To my 39 , they published it and sent me two dollars. I was a published and paid writer. I showed my teacher and fellow students. They laughed, “Just plain dumb luck,” the teacher said. I 40 success. I’d sold the first thing I’d 41 written. That was more than any of them had done and if it was just dumb luck that was fine with me. During the next two years I sold dozens of poems and letters. By the time I graduated from high school, I had scrapbooks (剪贴簿) 42 my published works. I never 43 my writing to my teachers, friends or my family 44 because they were dream killers. I had four children at the time. 45 the children slept, I typed on my ancient typewriter. I wrote what I felt. It took nine months. I chose a 46 and mailed it. A month later I received a contract, an advance on payments, and a request to start 47 another book. Crying Wind, became a best seller, was translated into fifteen languages and sold worldwide. My first book also became 48 reading in native American schools in Canada. The 49 year I ever had as a writer I earned two dollars. In my best year I earned 36,000 dollars. People ask what college I 50 , what degrees I had and what qualifications I have to be a writer. The answer is: “None.” I just write. I’m not a genius. I use an electric typewriter that I paid a hundred and twenty nine dollars 51 six years ago. I do all the housework and 52 my writing in a few minutes here and there. I’ve written eight books. To all those who dream of writing, I’m shouting at you: “Yes, you can. Don’t listen to them.” I don’t write right 53 I’ve succeeded. Writing is 54 , it’s fun and anyone can do it. 55 , a little dumb luck doesn’t hurt.
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