阅读理解。阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。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 generation has access to more nutritious food，more convenient transport，bigger houses，better cars，and of course，more pounds and dollars than any who lived before us .This will continue as long as we use these things to make other things.The more we specialize and exchange，the better off we'll be.

　　2) Brilliant advances

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