问题
解答题
半径为r的圆的面积是边长为r的正方形面π倍．______．（判断对错）
答案
设圆的半径为r，
则正方形的面积=r×r=r2，
圆的面积=πr2，
所以πr2÷r2=π倍．
故答案为：√．
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半径为r的圆的面积是边长为r的正方形面π倍．______．（判断对错）
设圆的半径为r，
则正方形的面积=r×r=r2，
圆的面积=πr2，
所以πr2÷r2=π倍．
故答案为：√．
A Leap(跳跃)to Honor Leaping on a narrow balance beam(平衡木) is not easy.But Lola Walter, a 13－year－old gymnast, is an expert at it. To perfect her skills, Lola ____ for four hours a day, five days a week.At the state championships in March, she finished seventh out of 16 girls. That's especially impressive，____she is legally blind, born with a rare condition that causes her eyes to shift(移动)constantly.She often sees double and can't ____ how far away things are. When she was little, her mom ___ that even though she couldn't see ____ , she was fearless.So her mom signed her up for gymnastics when she was three.She loved the ____ right away and gymnastics became her favorite. Though learning gymnastics has been more ____ for her than for some of her teammates, she has never quit.She doesn't let her ____ stop her from doing anything that she wants to. She likes the determination it takes to do the sport.Her biggest ____ is the balance beam.Because she has double vision, she often sees two beams.She must use her sense of touch to help her during her routine.Sometimes she even closes her eyes.“You have to ____ your mind that it'll take you where you want to go，” says Lola. To be a top－level gymnast, one must be brave.The beam is probably the most ____ for anyone because it's four inches wide.At the state competition, Lola didn't fall ____ the beam.In fact, she got an 8.1 out of 10——her highest score yet. Lola doesn't want to be ____ differently from the other girls on her team.At competitions, the judges don't know about her vision ____.She doesn't tell them, because she doesn't think they need to know.Her mom is amazed by her ____ attitude. Lola never thinks about ____.She is presently at level 7 while the highest is level 10 in gymnastics.Her ____ is to reach level 9.She says she wants to be a gymnastics coach to pass down what she's learned to other kids ____ she grows up. Lola is____of all her hard work and success.She says it's helped her overcome problems in her life outside gymnastics too.Her ____ for others is “just believe in yourself”．
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