GRE阅读练习每日一篇(四十三)_GRE阅读

　　It could have been produced by the addition of other metals during the processing of the copper ore.

　　24. According to the passage, possible sources of the lead found in a copper or bronze artifact include which of the following?

　　I. The copper ore used to manufacture the artifact

　　II. Flux added during processing of the copper ore

　　III. Other metal added during processing of the copper ore

　　I only

　　II only

　　III only

　　II and III only

　　I, II, and III

　　25. The author rejects copper as the ideal choice mentioned in line 33 because

　　the concentration of copper in Bronze Age artifacts varies

　　elements other than copper may be introduced during smelting

　　the isotopic composition of copper changes during smelting

　　among common copper ores, differences in copper isotope composition are too small

　　within a single source of copper ore, copper isotope composition can vary substantially

　　26. The author makes which of the following statements about lead isotope composition?

　　It often varies from one copper-ore source to another.

　　It sometimes varies over short distances in a single copper-ore source.

　　It can vary during the testing of artifacts, producing a measurement error.

【GRE阅读练习每日一篇(四十三)】相关文章：

1 2 3 4 567 显示全文

上一篇：GRE阅读长难句实例分析38 下一篇：GRE阅读练习每日一篇(五十一)

GRE阅读 最新: GRE阅读陌生词汇的技巧
2016-03-01; GRE阅读题选项的原则
2016-03-01; 新GRE阅读经典句式盘点
2016-03-01; GRE阅读翻译练习
2016-03-01; GRE阅读主旨题解题技巧
2016-03-01; GRE阅读高分技巧
2016-03-01

网友关注: 2016高考英语一轮复习 Unit4《Astronomy the science of the stars》知能达标训练新人教版必修3; 2016届高三英语一轮复习模块5 Unit1《Gettingalongwithothers》学案; 2016高考英语一轮复习 Unit4《Body language》知能达标训练新人教版必修4; 2016届高三英语一轮复习模块1 Unit1《Schoollife》学案; 2016届高三英语一轮复习模块4 Unit1《Advertising》学案; 2016届高三英语一轮复习模块2 Unit2《Wishyouwerehere》学案; 2016届高三英语一轮复习模块5 Unit3《Scienceandnature》学案; 2016高考英语一轮复习 Unit2《Healthy eating》知能达标训练新人教版必修3; 2016高考英语一轮复习 Unit2《Women of achievement》知能达标训练新人教版必修5; 2016届高三英语一轮复习模块4 Unit3《Tomorrow’sworld》学案