【单选题】
It may be necessary, in order that .future{{U}} (51) {{/U}}can enjoy clean air, that more of the{{U}} (52) {{/U}}is borne by long-term central government funD、As air pollution varies enormously from place to place and can, indeed, be very local, it may also be necessary for the central government to{{U}} (53) {{/U}}money so that local authorities can{{U}} (54) {{/U}}special local problems. That these can be significant was shown by the report made in 1970{{U}} (55) {{/U}}behalf of the LondonBoroughsAssociation. This{{U}} (56) {{/U}}that in central London since 1958 smoke concentrations have decreased by 80 percent, whereas sunshine has increased by 70 percent and winter visibility has{{U}} (57) {{/U}}threefold, There have been{{U}} (58) {{/U}}in mortality and hospital admissions{{U}} (59) {{/U}}with air pollution and in the response to it of bronchitis, as well as clear if less documented increases in plant types and bird{{U}} (60) {{/U}}n the cities.
A．improved
B．shared
C．added
D．proved
网考网参考答案：A
网考网解析：A项improved意为“提高，改进”，B项shared意为“分享，分担”，C项added“增加”和D项proved“证实”虽都是动词，但与上下文的意思不吻合。根据题意，这里应选A。
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