《2025年快乐过暑假江苏凤凰科学技术出版社八年级提优版》

3. 已知$y= (1-m)x^{m^{2}-2}$是反比例函数,则$m= $$-1$。

答案： $-1$

4. 反比例函数$y= \frac{9}{x}$,$y= \frac{4}{x}$的图像如图所示,点$A在y= \frac{9}{x}$的图像上,连接$OA交y= \frac{4}{x}的图像于点B$,则$AB:BO$的值为$\frac{1}{2}$。

答案： $\frac{1}{2}$

5. 如图,四边形$ABCD$为正方形,点$A的坐标为(0,2)$,点$B的坐标为(0,-3)$,反比例函数$y= \frac{k}{x}(k≠0)的图像经过点C$,一次函数$y= ax+b(a≠0)的图像经过点C和点A$。
(1)求反比例函数与一次函数的表达式；
(2)点$P$是反比例函数图像上的一点,若$\triangle OAP的面积恰好等于正方形ABCD的面积的\frac{3}{5}$,求点$P$的坐标。
(1)反比例函数的表达式为$y=$$-\frac{15}{x}$，一次函数的表达式为$y=$$-x+2$。
(2)点$P$的坐标为$(15,-1)$或$(-15,1)$。

答案：
(1)反比例函数的表达式为 $y=-\frac{15}{x}$，一次函数的表达式为 $y=-x+2$。
(2)点 $P$ 的坐标为 $(15,-1)$ 或 $(-15,1)$。

1. Some people believe robots will refuse most jobs away from humans in the future.
2. Would you like to help the disabled people?
3. To be a good student, you should plan your time well and use every minute wisely.
4. Miss Zhao went to the USA for further study.
5. A child receives his early education from his parents.

答案： 1. B 2. C 3. C 4. D 5. D

二 阅读短文,从短文后A至F六个选项中选出五个可以填入空白处的最佳选项
A Famous Charity—Operation Smile
Have you ever heard of a famous charity called Operation Smile? 1D
Operation Smile was started by a doctor and his wife. In 1982, together with some volunteers, they went to the Philippines to help children who had holes in their lips or inside their mouths. 2E These volunteers worked very hard. But they worried that they could not carry on with the work because they were lack(缺乏) of money. Then they decided to start a charity so that they could help these needy children. They called it Operation Smile.
3A Operation Smile has won many prizes for its work and in 1999 they even started a special event called “The World Journey of Hope”. 53,000 children in 18 countries are cured during the event.
On the other hand, Operation Smile trains health care professionals in developing countries so that they can continue to help children when Operation Smile has left. 4B
So show your kindness and generosity(慷慨) to the needy children now. 5C The children who can smile now will thank you.
A. Operation Smile works in more than twenty developing countries and has cured over 30,000 children who have problems with their mouths.
B. As to the children with much more serious problems, they will send them to America for further treatment.
C. You can send your donation to Operation Smile at local banks.
D. We hope we can help you understand how we are trying to help children all over the world.
E. It was difficult for them to eat or drink.
F. It helps build a better world for everyone, especially for children all over the world.

答案： 1. D 2. E 3. A 4. B 5. C