问题
选择题
曲线y=2x2在点P（1，2）处的切线方程是 [ ]
A．4x﹣y﹣2=0
B．4x+y﹣2=0
C．4x+y+2=0
D．4x﹣y+2=0
答案
答案：A
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曲线y=2x2在点P（1，2）处的切线方程是 [ ]
A．4x﹣y﹣2=0
B．4x+y﹣2=0
C．4x+y+2=0
D．4x﹣y+2=0
答案：A
| 完形填空。 | |||
| The Price of a Dream I grew up poor-living with my wonderful mother.We had little money,but plenty of love and attention.I was 1 and energetic.I understood that no matter how poor a person was,he could still 2 a dream. My dream was 3.By the time I was sixteen,I started playing baseball.I could throw a ninety-mile-per-hour fastball and 4 anything that moved on the football field.I was also 5 :my high school coach was John,who not only believed in me,but also taught me 6 to believe in myself.He 7 me the difference between aving a dream and remaining true to that dream.One particular 8 with Coach John changed my life forever. A friend recommended me for a summer job.This meant a chance for money in my pocket money for a new bike,new clothes and the 9 of savings for a house for my mother. Then I realized I would have to 10 up summer baseball to handle the work schedule,and meant I would have to tell John I wouldn't be playing. When I told John,he was 11 as I expected him to be."You have your whole life to work," he said,"Your 12 days are limited.You can't afford to waste them." I stood before him with my head 13,trying to think of the 14 that would exp  lain to him why my dream of buying mymom a house and having money in my pocket was worth facing his 15 in me. "How much are you going to make at this job,son?" he asked."3.5 dollars an hour," I replied. "Well," he asked,"is $3.5 an hour the price of a dream?" That simple question made 16 for me the difference between 17 something right now and having a 18.I decided myself to play sports that summer and 19 the year I was hired by the Pittsburgh Pirates to play baseball,and was 20 a $20 000 contract(合同).In 1999,I bought my mother the house of my dream! | |||
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