. 细节理解题。理解第四段可知，都在描述造成教师睡眠差的障碍是对教学的勤奋和奉献。答案为C。

　　. 推理判断题。理解文章最后一段可知，想要第二天工作效率高，我们应该放下思想包袱，睡个好觉。选B。

　　考点：科普类文章

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　Having bad feeling about 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.”

　　1 )

　　42

　　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, and better cars.

　　43

　　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

　　One reason we are richer, healthier, taller, cleverer, longer lived 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.

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