20．A.and B．or

　　C．but D．so

　　C　[根据此空前的lost和此空后的beautiful可知前后语义相反，所以用but表示转折关系。]

　　Ⅳ.阅读理解

　　(2016·银川高三一模)The decision of the Third Plenum of the 18th Central Committee of the Communist Party of China to allow a married couple to have two children if one of the couple is an only child is indeed welcome news to the many young couples who want to have more than one child.

　　What is even more meaningful is the statement in the decision that the family planning policy will be gradually adjusted to promote demographic (人口) development on a balanced and long­term basis.

　　Such flexibility is necessary, given the fact that China has the largest population in the world and one of the major engines for the global economy.People are now predicting further loosening as a higher birth rate is needed to offset the too low birth rate of the past and the rapid aging of society, which are putting pressure on economic growth and social progress.

　　Economists see the drop in the working­age population by 3.45 million in 2017 as strong evidence of the need for a much higher birth rate to avoid an economic crisis caused by a lack of labor.Sociologists consider the fertility (繁殖力) rate of 1.18 in 2017 as a sign of society being lacking in energy, and warn that the rapid increase of senior citizens will prevent the dynamics of both economic and social progress.

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