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随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本，课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒高考英语阅读理解试题之说理议论类
Feeling blue about the world? “Cheer up.” says science writer Matt Ridley. “The world has never been a better place to live in， and it will keep on getting better both for humans and for nature.”
Ridley calls himself a rational optimist—rational， because he‘s carefully weighed the evidence; optimistic， because that evidence shows human progress to be both unavoidable and good. And this is what he’s set out to prove from a unique point of view in his most recent book， The Rational Optimist. He views mankind as a grand enterprise that， on the whole， has done little but progress for 100，000 years. He backs his findings with hard facts gathered through years of research.
Here‘s how he explains his views.
1 ) Shopping fuels invention
It is reported that there are more than ten billion different products for sale in London alone. Even allowing for the many people who still live in poverty， our own generat
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