话题六：说理议论类
(一)
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
