C) A submersible(潜艇).
D A scientist(科学家).
Oceans cover more than two-thirds of our planet. Yet, just a small fraction(一部分) of the underwater world has been explored. Now, Scientists at the Woods Hole Oceanographic Institution in Massachusetts(美国的洲名) are building(修建、建造)an underwater vehicle(一个水下的工具) that(引导的是定语从句,所以后面句子的主语仍然是an underwater vehicle)will carry(携带、运送)explorers as deep as(asas像。。。一样) 6,500 meters .1. The new machine(新的机器), known as(被看作是) a manned(是man的合成词,载人的) submersible(潜艇;潜水器) or human-operated(由人来操控的) vehicle , will replace(动词,相当于take the place of, 意思是代替、替代) another one named(被称做,过去分词做定语) Alvin which(引导定语从句)has an amazing(令人吃惊的) record(记录) of discovery(探索、发现), playing a key role in(在。。。方面起者关键作用) various(各种各样的)
important and famous undersea expeditions(探险、考察). Alvin has been operating(运行) for 40 years but can go down(下沉) only 4,500 meters . Its about time for an upgrade(升级), WHOI researchers(研究人员们) say.
分析并得出结论:通过对该段第二、第三句话意思的了解,可以确定答案就是C。
3. 接下来,我们一起阅读第2题:
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