One reason we are richer，healthier，taller，cleverer，longer­lived and freer than ever before is that the four most basic human needs—food，clothing，fuel and shelter—have grown a lot cheaper.Take one example.In 1800 a candle providing one hour's light cost six hours' work.In the 1880s the same light from an oil lamp took 15 minutes' work to pay for.In 1950 it was eight seconds.Today it's half second.

　　3) Let's not kill ourselves for climate change

　　Mitigating(减轻) climate change could prove just as damaging to human welfare as climate change itself.A child that dies from indoor smoke in a village，where the use of fassil­fuel(化石燃料) electricity is forbidden by well­meaning members of green political movements trying to save the world，is just as great a tragedy as a child that dies in a flood caused by climate change.If climaic change proves to be mild，but cutting carbon causes real pain，we may well find that we have stopped a nose­bleed by putting a tourniquet(止血带) around our necks.

　　人类的进步是无法阻挡的，是令人乐观。在《理性的乐观主义者》一书中，作者阐述了自己对于生活中的乐观现象，并且对于购物这样普通的日常行为所带来的积极影响都做了详尽的分析和描述。

　　．What is the theme of Ridley's most recent book?

　　A．Weakness of human nature.B．Concern about climate change.

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