本帖最后由 双城记_ 于 2013-9-27 08:10 编辑
先推荐一个网站
http://freerice.com/#/english-vocabulary/1409
简单介绍：让你的孩子在上面学习，网站给饥饿的人提供食物。孩子学习的越多，就有更多的免费食物发给这些人。
Freerice is a non-profit website that is owned by and supports
the United Nations World Food Programme.
Freerice has two goals:
Provide education to everyone for free. - Help end world hunger by providing rice to hungry people for free.
This is made possible by the generosity of the sponsors who advertise on this site.
Whether you are CEO of a large corporation or a street child in a poor country, improving your education can improve your life. It is a great investment in yourself.
Perhaps even greater is the investment your donated rice makes in hungry human beings, enabling them to function and be productive. Somewhere in the world, a person is eating rice that you helped provide.
数学学习字典苹果软件10月18日前免费。不错：Mathletics Dictionary. 是3PLearning公司提供。
