在直角坐标系中，如果两点A（a，b），B（-a，-b）函数y=f（x）的图象上， 发布时间：2017-04-30 08:51 │ 来源：www.tikuol.com 题型：填空题 问题： 在直角坐标系中，如果两点A（a，b），B（-a，-b）函数y=f（x）的图象上，那么称[A，B]为函数f（x）的一组关于原点的中心对称点（[A，B]与[B，A]看作一组）．函数g（x）=cosπ2x，x≤0log4(x+1)，x＞0关于原点的中心对称点的组数为______．
题型：填空题 根据短文，完成表格。 Quality after-school programs are designed to improve academic performance, decrease youth crimes andother high-risk behaviors, and help young people grow into healthy, successful adults. The effect of quality after-school programs on academic performance is clear. Studies show that students who take part in such programs show better work habits, higher rates of homework completion, improved grades, and higher scores on achievement tests. They also have fewer absences and are less likely to blame. After-school programs also influence high-risk teen behaviors. Various studies show decreased rates of crime,drug-taking, and teen sex among youth who join in well-run after-school programs when compared to similaryouth who do not. Finally, after-school programs play an important role in supporting different kinds of fieldsof development: physical development, mental development and social development. Thus, one can safely say that after-school programming is an effective method to help young people become contributing members of society. Although there is enough proof from both small and large assessments that after-school programs can makea positive difference, it is important to note that not all programs are equal. First, dosage matters-young people who attend the most hours over the most years benefit more than members who attend less often or over a shorter period of time. Next, after-school programs make a bigger difference for those students who need helpmost and have the fewest choices. Finally, program qualities matter. After-school programs work best when they create unique opportunities for youth. They should provide opportunities, skill building meaningful involvement, expression, suggestion, service, and work. Staff characteristics make an important difference in the quality of a program. The adults should treat youth as partners, create safe and fair environment, encouragepersonalized involvement, and actively create learning opportunities. In short, although after-school programs have a promising future, how they are designed and run matters. Title: Quality After-school Programs Aims1. ______ academic performance Decreasing youth crimes and other high-risk behaviors Helping young people grow into healthy, successful adults 2.______Improved academic performance ●better work habits ●higher rates of homework completion ●improved grades and higher scores ●fewer absences and 3.______ blame Decreased high-risk teen behaviors ●decreased rates of crime ●drug 4.______●teen sex among youth5.______ development ●physical development ●mental development ●social developmentResult Helping young people become members making a 6.______ to society Factor 7.______ matter. Qualities matter.8.______ The future of after-school programs is promising, 9.______ how to design and run the programsis very 10.______ 查看答案