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阅读下面的短文。每篇短文的后面有五个问题，每个问题有四个备选答案。请根据短文的内容选择最佳答案。每个试题计3分,共计15分。 Alvin was launched in 1964.Since then，Alvin has worked between 200 and 250 days a year，says Daniel Fornari，a marine geologist and director of the Deep Ocean Exploration Institute at WHOI.During its lifetime，Alvin has carried some 12,000 people on a total of more than 3,000 dives. A newer，better versions of Alvin is bound to reveal even more surprises ahout a world that is still full of mysteries，Fornari says.It might also make the job of exploration a little easier.We take so much for granted on land, Fornari says.We can walk around and see with our eyes how big things are. We can see colors，special arrangements. Alvin can go up and down at a rate of 30 meters every second，and its maximum speed is 2 knots ，while the new vehicle will be able to ascend and descend at 44 meters per second.Itll reach speeds of 3 knots，or 3.5 miles per hour.5frAkFEndaivp underwateradj. boundadj.受约束的，一定的 水下的;adv.在水下 maneuverableadj. undersea adj.海底的 overlap v. n.重叠 upgraden.升级 注释： 1. Woods Hole：美国马萨诸塞州的一个渔村，但同时拥有许多重要研究机构，如：the Marine Biological Laboratory，the Sea Education Association以及the Woods Hole Oceanographic lnstitution。 | 
