黄金阅读The Geologic History of the Mediterranean第三题求解

rainandcmUID: 2442269

Paragraph 3: With question such as these clearly before them, the scientists aboard the Glomar Challenger processed to the Mediterranean to search for the answers. On August 23, 1970, they recovered a sample. The sample consisted of pebbles of gypsum and fragments of volcanic rock. Not a single pebble was found that might have indicated that the pebbles came from the nearby continent. In the days following, samples of solid gypsum were repeatedly brought on deck as drilling operations penetrated the seafloor. Furthermore, the gypsum was found to possess peculiarities of composition and structure that suggested it had formed on desert flats. Sediment above and below the gypsum layer contained tiny marine fossils解题点

, indicating open-ocean conditions. As they drilled into the central and deepest part of the Mediterranean basin, the scientists took solid, shiny, crystalline salt from the core barrel. Interbedded with the salt were thin layers of what appeared to be windblown silt.

3．What does the author imply by saying “Not a single pebble was found that might have indicated that the pebbles came from the nearby continent”?
○The most obvious explanation for the origin of the pebbles was not supported by the evidence.
○The geologists did not find as many pebbles as they expected.
○The geologists were looking for a particular kind of pebble.

○The different pebbles could not have come from only one source.
此题答案给的是A。求解。谢谢啦

dkflameUID: 2680233

这句话读懂意思就可以了。。。
没有一个可以表明来自周围大陆的鹅卵石被发现。
（我翻译的不好，但是大致意思就是没有发现这样的石头，但是这石头是用来证明鹅卵石的起源的）所以选A。