问题 单项选择题

在过去两个世纪内,人类排放的二氧化碳40%被海洋所吸收,大海减缓了全球变暖的步伐,但是将付出高昂的代价:与工业化前水平相比,二氧化碳导致海洋的平均PH值降低了大约0.1个单位。视现在二氧化碳的排放速度,到21世纪中叶,海洋的平均PH值下降可以高达0.35个单位。海洋酸化给海洋生物带来了严重损害,实验表明,PH值降低0.2—0.3个单位,将干扰海洋生物中最重要的基础生物珊瑚虫以及其它浮游生物的骨骼钙化。为了保护海洋生物,需将PH值下降范围控制在0.2以内,这是1976年美国国家环境保护局发布的极限值。
这段文字意在说明( )。

A.二氧化碳大量排放引发海洋酸化,海洋生物面临生存危机
B.海洋酸化危害海洋生物生存,二氧化碳减排迫在眉睫
C.海洋酸化将引发新一轮的环境危机,须警惕其对海洋生物的危害
D.对海洋酸化的趋势应引起重视,务必将PH值控制在极限值以内

答案

参考答案:B

解析: 这段文字主要阐述了由于二氧化碳的过量排放,人类将不得不面对海洋酸化的现象,海洋酸化威胁着海洋生物的生存,为了保护海洋生物,必须减少二氧化碳排放,以此来遏制海洋酸化的趋势,这个问题已刻不容缓,与此一致的为B。

阅读理解

Glacier National Park in Montana shares boundaries with Canada, an American Indian reservation, and a national forest. Along the North Fork of the Flathead River, the park also borders about 17,000 acres of private lands that are currently used for ranching, timber, and agriculture. This land is an important part of the habitat and migratory routes for several endangered species that frequent the park. These private lands are essentially the only ones available for development in the region.

With encouragement from the park, local landowners initiated a landuse planning effort to guide the future of the North Fork. The park is a partner in an interlocal agreement that calls for resourcemanaging agencies to work together and with the more than 400 private owners in the area. A draft plan has been prepared, with objective of maintaining traditional economic uses but limiting new development that would damage park resources. Voluntary action by landowners, in cooperation with the park and the county, is helping to restrict smalllot subdivisions, maintain wildlife corridors, and minimize any harmful impact on the environment.

The willingness of local landowners to participate in this protection effort may have been stimulated by concerns that congress would impose a legislative solution. Nevertheless, many local residents want to retain the existing character of the area. Meetings between park officials and landowners have led to a dramatically improved understanding of all concerns.

73. The passage mainly discusses ______.

A. the endangered species in Glacier National Park

B. the protection of lands surrounding Glacier National Park

C. conservation laws imposed by the state of Montana

D. conservation laws imposed by Congress 

74. Why are the private lands surrounding Glacier National Park so important?

A. They function as a hunting preserve.B. They are restricted to government use.

C. They are heavily populated. 

D. They contain natural habitats of threatened species. 

75. The relationship between park officials and neighboring landowners may best be    described as ______.

A. indifferent                      B. intimate C. cooperative               D. disappointing

76. It can be inferred from the passage that a major interest of the officials of Glacier     National Park is to ______.

A. limit land development around the park       B. establish a new park in Montana

C. influence national legislation           D. settle border disputes with Canada 

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