首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A study of people who used cell phones for an average of less than three years found no evidence the devices cause brain cancer.
A study of people who used cell phones for an average of less than three years found no evidence the devices cause brain cancer.
admin
2010-03-26
34
问题
A study of people who used cell phones for an average of less than three years found no evidence the devices cause brain cancer. The research didn’t, however, answer the question of whether longer-term use is dangerous. The study of 891 people did find a slightly increased risk for a rare type of brain cancer, but the researchers said it was not statistically significant. While they acknowledged longer-term studies are needed, the researchers said the overall results should reassure the more than 86 million cell-phone users nationwide. "We feel confident that the results reflect that cell phones don’t seem to cause brain cancer," said epidemiologist Joshua Muscat, a scientist at the American Health Foundation who helped lead the study.
Publication of Muscat’s research prompted the New England Journal of Medicine to release a study showing similar results. The study, led by National Cancer Institute researchers, looked at 782 brain cancer patients and 799 people without cancer. Maximum cell-phone use was at least an hour per day for five or more years, and no brain-cancer link was found even at that level.
Unlike regular telephones, handheld cell phones contain an antenna inside the receiver, which puts the user’s brain close to the electromagnetic radio waves the antenna emits. Since cell phones were introduced in the United States in 1984, conflicting data have emerged from safety studies on animals and humans.
The Food and Drag Administration (FAD) has said there is no evidence that the phones are unsafe, but it has joined with wireless industry in sponsoring research on the devices. Some cell-phone makers have also started disclosing their products’ radiation levels.
Another study involved phone-use questionnaires given to 469 men and women aged 18 to 80 with brain cancer and a 422-member cancer-free control group. Cell-phones use was slightly more common among the cancer-free participants, though average cell-phone use for both groups was under three hours monthly for less than three years.
The amount and duration of cell-phone use were not related to an increase brain cancer risk except for a type of neuron-cell tumor called neuroepitheliomatous cancer. Of the 35 patients with this rare tumor, 14 percent used cell-phones.
In the first paragraph, it can be concluded that ______.
选项
A、people have no need to worry cell phones can cause cancer
B、it is not dangerous for long-term cell-phone users
C、cell-phone users reassure them about using cell-phones
D、they found a slightly increased risk for a rare type of brain cancer
答案
C
解析
推理判断题。根据文章的第一段While they acknowledge...the researchers said the overall results should reassure the more than 86 million cell-phone users nationwide. 他们承认有必要进行更长时间的研究,但同时也声称总体的结果应该令全美8600多万移动电话用户放心。可知C是正确答案。A“人们没必要担心移动电话会引起癌症”,这种做法太绝对,这种选项在考试中通常不可选;B“长时间使
转载请注明原文地址:https://kaotiyun.com/show/d1OK777K
0
大学英语六级
相关试题推荐
A、Theimportanceofplay.B、Theimportanceofbooks.C、Therelationshipbetweenplayandwork.D、Children’sspeechdevelopment.
AccordingtoDavidTyack,thepopularbeliefineducationisthat______.Someeducatorsbegintoteachgirlsandboysseparate
A、Americanindustrialists.B、Frencheconomists.C、Internationalleaders.D、CivilWarveterans.BWhofirstusedthemottolaisser
Whydowecry?Canyouimaginealifewithouttears?Notonlydotearskeepyoureyeslubricated,theyalsocontaina(36)______
Whydowecry?Canyouimaginealifewithouttears?Notonlydotearskeepyoureyeslubricated,theyalsocontaina(36)______
A、Shethinksherpayforthejobistootow.B、Shebelievessheshouldbepromotedasamanager.C、Shethinksherjobcannotmak
A、Inaphotographer’sstudio.B、Inthelibrary.C、Inthepostoffice.D、Intheshoppingcenter.AWherearethephotosmuchcheap
Publicrelationsismanagementfunctionthatcreates,develops,andcarriesoutpoliciesandprogramstoinfluencepublicopinio
A、BecauseApplehasmadeandplayedalotofads.B、Becausetheyaregettingsmallerandsmaller.C、Becausetheykeepdeveloping
Theuseofwaterreferredinthispassageis______.Inthematterofdevelopingenergyfromoceanwater,Britainis______.
随机试题
某基金A在持有期为12个月、置信水平为95%的情况下,若计算的风险价值为5%。则以下表述正确的是()。
若二维数组a有m列,则在a[i][j]前的元素个数为()。
走合期的使用要求有_______。
预算控制
金属材料分为黑色金属和有色金属两大类。其中,有色金属种类较多,常用的有()。
下列资产负债表日后事项中,属于非调整事项的有( )。
下列关于购买火车票的说法中,正确的是()。
在一棵二叉排序树上,查找关键字为35的结点,依次比较的关键字有可能是()。
Tellmeaboutafamouspersonwhoyouparticularlyadmire.Youshouldsay:whothepersonis(was)andwhytheyare(were)famo
StudyActivitiesinUniversityInordertohelpcollegeanduniversitystudentsintheprocessoflearning,fourkeystudyac
最新回复
(
0
)