问答题

中国科研人员每年发表的论文数量之大，令人吃惊，但学术价值高的只是很小一部分。愿意从事耗时的实验和敢于克服困难是有成就科学家的基本素质。伴随成功的往往是失败。不论结果如何，任何为创新做出的努力都是有回报的。

【参考答案】

Researchers in China annually publish a surprisingly large n......

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The double persona that the British used to have is mentioned as evidence that ______.
A. they used to care about their manners when necessary
B. they have behaved consistently on each occasion
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D. they never paid any attention to their own manners
问答题
Desertification is the accumulated result of inappropriate land use and a harsh climate. Over-cultivation exhausts the soil, overgrazing leaves behind little vegetation that protects it from erosion, deforestation destroys the trees that bind the soil to the land and underdeveloped irrigation systems turn croplands salty. The semi-dry lands bordering desert exist in a delicate ecological balance and are limited in their potential to adjust to increased environmental pressures. The causes are multiple and interact in a complex manner. Lacking alternative survival strategies, farmers tend to over-exploit natural resources. Soil nutrients and organic matter begin to diminish once intensive agriculture consumes quantities of nutrients greater than the soil’s natural regeneration capacities.
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