[解析]
(1)目的意图题。根据文章第一段中It turned out that Darwin was more interested in natural history than medicine.While he continued his studies at Cambridge,it was his focus on natural history that became his passion.(事实证明,达尔文对自然史比对医学更感兴趣。当他继续在剑桥大学学习时,他对自然历史的关注成为他的热情所在。)可知,第一段的目的是为了说明他对自然史感兴趣,使他在未来的自然研究道路上铺平了道路,故选C项。
(2)观点态度题。根据文章第三段Darwin spent much of the trip on land collecting samples of plants,animals,rocks,and fossils.He explored regions in Brazil,Argentina,Chile,and remote islands such as the Galápagos.He packed all of his samples into large wooden containers and sent them back to England aboard other large ships.(达尔文在陆地上花费了大部分时间收集植物、动物、岩石和化石的样本。他探索了巴西、阿根廷、智利和偏远岛屿如加尔阿帕戈斯群岛的地区。他把所有的样品装进大木箱里,然后用其他大船运回英国。)推知,达尔文在HMS Beagle号船上作为自然学家的身份,对采集样本和探索自然充满热情,故选B项。
(3)细节理解题。根据文章第四段The theory of natural selection says that individuals of a species are more likely to survive in their environment and pass on their genes to the next generation when they inherit traits from their parents that are best suited for that specific environment(自然选择理论认为,当一个物种的个体从父母那里继承了最适合该特定环境的特征时,他们更有可能在他们的环境中生存并将他们的基因传递给下一代。)可知遗传到父母特征的动物,适合特定环境,故选C项。
(4)主旨大意题。通读全文可知,本文主要介绍了达尔文如何通过他的航行和对自然的观察,最终发展出自然选择和物种进化的理论,即达尔文自然选择理论的诞生。故选C项。