本文来自文勇新托福黄金精选阅读真题201505版
TPO4
official model exam文章，<meteorite impact and dinosaur extincion>。
其中第3-4题我始终选不出正确答案。
第三题我选3，正确2；第四题我选2，正确1。
因为是段落细节题，这里就不用贴全文了。题目如下，请各位大神帮忙。谢谢！
【Paragraph 3】The body that impacted Earth at the endof the Cretaceous period was a meteorite with a mass of more than a trilliontons and a diameter of at least 10 kilometers. Scientists first identified thisimpact in 1980 from the worldwide layer of sediment deposited from the dustcloud that enveloped the planet after the impact. This sediment layer isenriched in the rare metal iridium and other elements that are relativelyabundant in a meteorite but very rare in the crust of Earth. Even diluted bythe terrestrial material excavated from the crater, this component ofmeteorites is easily identified. By 1990 geologists had located the impact siteitself in the Yucat region of Mexico. The crater, now deeply buried in sediment,was originally about 200 kilometers in diameter. 3. Whichof the following can be inferred from paragraph 3 about the location of themeteorite impact in Mexico? ○Thelocation of the impact site in Mexico was kept secret by geologists from 1980to 1990. ○It was awell-known fact that the impact had occurred in the Yucat region. ○Geologistsknew that there had been an impact before they knew where it had occurred. ○TheYucat region was chosen by geologists as the most probable impact site becauseof its climate.
4.According to paragraph 3, how did scientists determine that a large meteoritehad impacted Earth? ○Theydiscovered a large crater in the Yucat region of Mexico. ○Theyfound a unique layer of sediment worldwide. ○Theywere alerted by archaeologists who had been excavating in the Yucat region. ○Theylocated a meteorite with a mass of over a trillion tons.
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发表于 2016-6-10 16:12:49
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