问题
选择题
已知集合A={x|x（x-1）=0}，那么（ ）
A．0∈A
B．1∉A
C．-1∈A
D．0∉A
答案
由x（x-1）=0得x=0或x=1，
∴A={0，1}，
∴0∈A，
故选A．
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已知集合A={x|x（x-1）=0}，那么（ ）
A．0∈A
B．1∉A
C．-1∈A
D．0∉A
由x（x-1）=0得x=0或x=1，
∴A={0，1}，
∴0∈A，
故选A．
“Sixteen,” I said. I have forgotten the math question my second-grade teacher, Joyce Cooper, asked that day, but I will never forget my 36 . As soon as the number left my mouth, the whole class started 37 . I felt like the 38 person in the world.. Mrs. Cooper fixed them with a firm look. Then she said: “We’re all here to 39 .” Once Mrs. Cooper asked us to write a 40 about what we hoped to do in the future. I wrote: “I want to be a 41 like Mrs. Cooper. She wrote on my report, “You would 42 an outstanding teacher 43 you are determined and you try hard.” I was to carry those 44 in my heart for the 27 years. After I graduated from high school, I got married and had children. We needed every penny just to 45 . College and teaching were out of the question. Then one day I thought of my 46 of how I wanted to help children. I talked it over with my family and 47 to attend college classes in the 48 before work. And when I got home from work, I would 49 . Finally, after seven years, my dream had been realized and I became a teacher. Not long after I started 50 , something happened that brought the 51 rushing back to me. I had written a sentence with grammatical errors on the blackboard. Then I asked students to come and 52 the mistakes. One girl got halfway through, became 53 and stopped. As the other children laughed, 54 rolled down her cheeks. I gave her a hug and told her to have a drink of water. Then, remembering Mrs. Cooper, I fixed 55 of the class with a firm look. “We are all here to learn,” I said.
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