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Unformatted text preview: reated over 500 million years ago在
6. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information 在 ○The discovery of regional differences in the sequences of rocks led geologists to believe that rock types could someday become reliable time markers在 ○Careful analysis of strata revealed that rocks cannot establish geological time because the pattern of rock layers varies from place to place在 ○Smith's catalogs of rock strata indicated that the sequences of rocks are different from place to place and from region to region在
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○Because people did not catalog regional differences in sequences of rocks. It was believed that rocks could never be reliable time markers
7. Why does the author use the phrase “Quartz is quartz"? ○To describe how the differences between Pleistocene and Cambrian quartz reveal information about dating rocks ○To point out that the chemical composition of quartz makes it more difficult to date than other rocks
○To provide an example of how regional differences in rock sequences can make a particular rock difficult to date ○To explain that rocks are difficult to use for dating because their chemical compositions always remain the same over time
Paragraph 4: As he collected fossils from strata throughout England, Smith began to see that the fossils told a different story from the rocks. Particularly in the younger strata the rocks were often so similar that he had trouble distinguishing the strata, but he never had trouble telling the fossils apart 在 While rock between two consistent strata might in one place be shale and in another sandstone, the fossils in that shale or sandstone were always the same 在Some fossils endured through so many millions of years that they appear In many strata 在but others occur only in a few strata, and a few species had their births and extinctions within one particular stratum 在 Fossils are thus identifying markers for particular periods in Earth's history在
8.According to paragraph 4在it was difficult for Smith to distinguish rock strata because ○the rocks from different strata closely resembled each other
○he was often unable to find fossils in the younger rock strata
○their similarity to each other made it difficult for him to distinguish one rock type from another
○the type of rock between two consistent strata was always the same
9. The word endured in the passage is closest in meaning to ○vanished
Paragraph 5: Not only could Smith identify rock strata by the fossils they contained, he could also see a pattern emerging在certain fossils always appear in more ancient sediments while others begin to be seen as the strata become more recent. By following the fossils, Smith was able to put all the strata of England's earth into relati...
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This note was uploaded on 09/17/2013 for the course LANGUAGE 13DL208 taught by Professor Wang during the Fall '13 term at East China Normal University.
- Fall '13