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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