4．Cell phones：Is there a cancer link？
worrying about the possibility that phones，power lines and Wi-Fi could be responsible for a range of illnesses，from rashes （疹子）to brain tumors．
Some say there is evidence to support the growing anxieties．David Carpenter，a professor of environmental health sciences at the university at Albany，in New York，thinks there's a greater than 95percent chance that power lines can cause childhood leukemia （a kind of blood disease）．Also there's a greater than 90percent chance that cell phones can cause brain tumors．"It's clear now that there's a real risk，"said Carpenter．
But others believe these worries caused by some experts'warnings are not justified （验证）．Dr Martha Linet，head of radiation epidemiology（流行病学）at the US National Cancer Institute，has looked at the same research as Carpenter but has reached a different conclusion．"I don't support warning labels （标签） for cell phones，"said Linet．"We don't have the evidence that there's much danger．"
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（调查） of cell phones and brain cancer，in 13countries outside the US，has been under way for several years．Its funded（provide money） in part by the European Union，in part by a cell phone industry group．The final report should come out later this year，but data （数据）so far don't suggest a strong link between cell phone use and cancer risk．
21．From the passage we can learn that some people are worried becauseC．
A．they have evidence that the use of cell phones can lead to cancer
B．they feel surprised and alarmed about cell phone use
C．some experts have given warnings
D．cell phones are responsible for brain tumors
22．By saying"I don't support warning labels for cell phones"，Dr Martha Linet thinks thatA．
A．the connection between cell-phones and cancer has not been proved．
B．cancer-warning labels should be on cell phones
C．there is a link between cell phones and cancer
D．cell phones have nothing to do with cancer at all．
23．Which of the following best describes the attitude of the author towards the debate？B
A．Optimistic． B．Objective（客观的）． C．Opposite． D． Hopeless．
分析 本文属于记叙文阅读，文章主要向我们讲述的是关于手机等的辐射是否对人体有害的各方观点，有人说电源线会导致儿童白血病，也有人认为这些担心是不合理的．
解答 21．C 推理判断题．根据文中第二段Also there's a greater than 90percent chance that cell phones can cause brain tumors．"It's clear now that there's a real risk，"said Carpenter．可知有些专家明确认为辐射会致病，并警告人们．故选C．
22．A 细节理解题．根据第四段最后一句The final report should come out later this year，but data （数据）so far don't suggest a strong link between cell phone use and cancer risk．可知该专家认为没有任何证据可以证明辐射可以对人体造成伤害．所以这些担心是没有必要的，故选A．
23．B 推理判断题．通读全文可知文中作者并没有明确表明自己赞成还是反对的观点，所以是比较客观地看待该问题．故选B．
点评 考查学生的细节理解和推理判断能力．做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确选择．在做推理判断题时不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
