句型转换
一个平行四边形的底是20厘米，高是12厘米．又知另一条底边上的高是16厘米，这个平行四边形的另一条底是____厘米
Good books are like wise friends. They support you to walk forward, and help you understand the world. TIME listed three best books of 2014 for teens. Have you read all of them?
Names of Books
Writers
Stories
This
One Summer
Jillian Tamaki &
Mariko Tamki, Canada
Every summer, Rose goes with her parents to a lake house. It’s their relaxing time. But this summer is different. Rose’s parents keep fighting. Rose meets a local teen. But later he is caught up in something bad. It’s really a summer of sorrow（悲伤）and growing up.
The Fourteenth Goldfish
Jennifer L. Holm, US
Ellie has never liked change. She misses everything in the past, especially her dearly dead goldfish. Then one day a strange boy who looks like Ellie’s grandfather shows up. He’s always obsessed（着迷的）with immortality（永生）. Has he finally found the secret to immortality with Ellie?
Absolutely Almost
（完全几乎）
Lisa Graff, US
Albie has always been an “almost”. He’s almost good at everything. In fact, Albie has a long list of the things he’s not very good at. But when Albie meets Calista, she helps him work out all of the things he is not good at. What will happen to this “almost” boy?
当今时代，文化在综合国力竞争中的地位和作用越来越突出，文化已经成为国家核心竞争力的重要因素。中国古代就有“以天下之至柔，驰骋天下之至坚”，“不战而屈人之兵”的说法。从文化视角来看，上述观点可以理解为（ ）
如图，在直角坐标系中，点P的坐标是（n，0）（n＞0），抛物线y=﹣x2+bx+c经过原点O和点P．已知正方形ABCD的三个顶点为A（2，2），B（3，2），D（2，3）．
（1）求c，b并写出抛物线对称轴及y的最大值（用含有n的代数式表示）；
（2）求证：抛物线的顶点在函数y=x2的图象上；
（3）若抛物线与直线AD交于点N，求n为何值时，△NPO的面积为1；
（4）若抛物线经过正方形区域ABCD（含边界），请直接写出n的取值范围.
