Studies so far suggest a weak connection between EMFs(电磁场) and illness—so weak that it might not exist at all. A multinational investigation of cellphones and brain cancer, in 13 countries outside the US, has been underway for several years. It's funded in part by the European Union, in part by a cellphone industry group. The final report should come out later this year, but data so far don't suggest a strong link between cellphone use and cancer risk.

　　20．From the passage we can learn that some people are worried because________．

　　A．they have evidence that the use of cellphones can lead to cancer

　　B．they make a fuss over cellphone use

　　C．some experts have given a warning

　　D．cellphones are responsible for brain tumors

　　21．By saying “I don't support warning labels for cellphones，” Dr Martha Linet has the idea that________cancer­warning labels should be on cellphones

　　C．there is a link between cellphones and cancer

　　D．cellphones have nothing to do with cancer

　　22．The underlined word “underway” is closest in meaning to________．

　　A．started

　　B．kept on

　　C．gone on

　　D．in progress

　　23．Which of the following best describes the attitude of the author towards the debate?

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