根据下面内容，回答题：

　　Oceanography has been defined as "The application of all sciences to the study of the sea".

　　Before the nineteenth century scientists with an interest in the sea were few and far between.Certainly Newton considered some theoretical aapects of it in his writings, but he was reluctant to goto sea to further his work.

　　For most people the sea was remote, and with the exception of early intercontinental travelers or others who earned a living from the sea, there was little reason to ask many questions about it, let alone to ask what lay beneath the surface. The first time that the question "What is at the bottom of the oceans?" had to be answered with any commercial consequence was when the laying of a tele-graph cable from Europe to America was proposed. The engineer had to know the depth profile (

　　形状)of the route to estimate the length of cable that had to be manufactured.

　　It was to Ma my of the US Navy that the Atlantic Telegraph Company turned,in 1853,for information on this matter. In the 1840s ,Ma my had been responsible for encouraging voyages during which soundings(测水深) were taken to investigate the depths of the North Atlantic and Pacific Oceans. Later,some of his findings aroused much popular interest in his book The Physical Geography of the Sea.

　　The cable was laid,but not until 1866 was the connection made permanent and reliable. At the early attempts, the cable failed and when it was taken out for repairs it was found to be covered in living growths, a fact which defied contemporary scientific opinion that there was no life in the deeper parts of the sea. Within a few years oceanography was under way. In 1872 Thomson led a scientific expedition( 考察) ,which lasted for four years and brought home thousands of samples from the sea.Their classification and analysis occupied scientists for years and led to a five-volume report, the last volume being published in 1895.

　　44The proposal to lay a telegraph cable from Europe to America made oceanographic studies take on.

　　A.an academic aspectB.a military aspectC.a business aspectD.an international aspect

　　参考答案：C

　　参考解析：

　　文章第三段第二句中“commercial con—sequence”表明海洋学的研究动力源于商业目的。

　　45It was__________that asked Meary for help in oceanographic studies.

　　A.the American NavyB.some early intercontinental travelersC.those who earned a living from the seaD.the company which proposed to lay an undersea cable "--

　　参考答案：D

　　参考解析：

　　文章第四段第一句话表明是大西洋电信公司向Maury求助的。

　　46The aim of the voyages Maury was responsible for in the 1840s was

　　A.to make some sounding experiments in the oceansB.to collect samples of sea plants and animalsC.to estimate the length of cable that was neededD.to measure the depths of the two oceans

　　参考答案：D

　　参考解析：

　　文章第四段第二句表明Maury负责测北大西洋和太平洋的水深。

　　47This passage is mainly about __________ .

　　A.the beginnings of oceanographyB.the laying of the first undersea cableC.the investigation of ocean depthsD.the early intercontinental communications

　　参考答案：A

　　参考解析：

　　通过对文章的阅读可知，文章讲述了海洋学从无到有的事实，也就是海洋学的起源。

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