高中英語外研版選修8同步練習(xí)：module5第2課時(編輯修改稿)
2025-01-11 00:11 本頁面
【文章內(nèi)容簡介】 and was up to 1,500 feet deep， said the team from the University of Colorado. “ This is the first clear evidence of shorelines on the surface of Mars， ” said Boulder39。 s research associate， Gaetano Di Achille， in a study published in the latest edition of Geophysical Rese arch Letters. “ The identification of the shorelines and acpanying geological evidence allows us to calculate the size and volume of the lake， which appears to have formed about billion years ago.” Analysis of the images has shown the water carved out the canyon(溪 谷 )in which it was found， which then opened out into a valley depositing(使淤積 )sediment(沉積 )which formed a delta(三角洲 )． “ Finding shorelines is a great discovery to us， ” said assistant professor Brian Hynek，adding it showed the lake existed at a time when Mars was thought to have been cold and dry. Scientists believe the oldest surfaces on Mars formed during the wet and warm era known as the Noachan epoch， about billion to billion years ago. The newly discovered lake is believed to date from the Hesperian era and postdates the end of the warm and wet period on Mars by 300 million years， according to the study. Scientists believe deltas next to the lake may well hold secrets about past life on Mars as such places on Earth have bee the natural deposits of anic carbon and other markers of life. 5. The size of the lake found on Mars is________. A． 80 square miles B． 1,500 square miles C． billion square miles D． 300 million square miles 答案： A 細(xì)節(jié)理解題 。 根據(jù)第二段中 “ The lake， which dates back some billion years，appears to have covered as much as 80 square miles” 一句 ， 可推知答案 。 6. When the lake existed， the weather on Mars was ________. A． hot and wet B． wet and warm C． cold and dry D． cold and wet 答案： C 細(xì)節(jié)理解題 。 根據(jù)第六段中 ? it showed the lake existed at a time when Mars was thought to have been cold and dry 知 ， 答案為 C。 7. Why do scientists think deltas near the lake may hold secrets about past life on Mars? A. Because similar places on Earth have bee natural deposits of markers of life. B． Because someone has put secrets about past life on Mars there. C． Because past life has been found in other deltas on Mars. D． Because some people are said to have already seen life marks there. 答案： A 細(xì)節(jié)理解題 。 由原文最后一句可直接找到答案
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