48.毒蘑菇事件是作者在第二段关于语言问题导致致命事故所举的例子。第二段最后一句作者讲道Presumably because the report of the treatment had been published only in journals written in European languages other than English.,由此我们可以推断美国医生大概很少读用英语以外的语言所写的报道或论著。故答案为They probably only read reports written in English。
49.第三段第二句But isolated examples do not give an impression of the size of the problem- something that can come only from studies of the use or avoidance of foreign-language materials and contacts in different communicative situations.中的size of the problem就是指问题的严重程度,即题目中的extent of the language barrier。可见研究外语材料的使用情况可以帮助了解语言障碍问题的程度。由此,答案可以是studies。第三段第三句In the English-speaking scientific world,for example,surveys of books and documents consulted in libraries and other information agencies have shown that very little foreign-language material is ever cnsulted.指出调查信息机构中书和文件的查阅情况可以知道对外语材料的查阅很少。可见调查这些材料的查阅情况可以获得证据。由此,答案也可以是surveys。
50.由第四段第三句In the 1960s,over two-thirds of British firms dealing with non-English- speaking customers were using English for out going correspondence;many had their sales literature only in English可见他们用英语来写往来函件和产品说明、销售宣传这样的一些材料。由于题目只要求写出一个例子,所以答案可以是sales literature或者outgoing correspondence。
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