C. the number of people who benefit from reading.

　　D. the number of books that each person reads.

　　参考答案1—4、BCDC

　　【2016高考训练】阅读下列短文，从每题所给的A.B.C和D项中，选出最佳选项。

　　Digging a Hole in China's Black Gold.

　　China's love affair with coal is set to last, but for investors the romance has come out of the relationship.

　　For the last few years, investors in China's coal section have been mining a rich seam(煤层). From the beginning of 2005 to the end of 2011, the level Qinhuangdao coal price rose 81%, supporting strong growth in profitability (利润)and enviable degree at mining majors like China Shenhua Energy.

　　But as any miner will tell you, the longer you work a seam, the more difficult it is to get value. China's coal prices have fallen nearly 10% in the last three months. A seasonal fall from the winter peak, and a cyclical（周期性的）slowdown brought about by China's slowing construction and money tightening, is only part of the picture. Those effects will fade, but coal miners will still have to battle against structural pressure for lower prices.

　　In 2008, China's 60 biggest miners the efficient excellences from a section with 9,000-plus firms accounted for just over half of civil production. Since then, the big have gotten bigger and the small are disappearing. Michael Parker, coal mining analyst at Sanford Bernstein, estimates in 2017 the top 60 miners will account for 80% of output.

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