首页
登录
职称英语
What is the speaker’s main topic? [br] [originaltext] Italian scientists hav
What is the speaker’s main topic? [br] [originaltext] Italian scientists hav
游客
2023-12-24
68
管理
问题
What is the speaker’s main topic? [br]
Italian scientists have raised new health concerns about the safety of using mobile phones, with research showing radio waves from the handsets makes cancerous cells grow more aggressively. When Fiorenzo Marinelli and his colleagues at the National Research Council in Bologna exposed leukemia cells in the laboratory to 48 hours of continuous radio waves they initially killed the cancer cells but then made the surviving tumor cells replicate more rapidly.
"We don’t know what the effects would be on healthy human cells," Marinelli told New Scientist magazine. In the Italian study, after 24 hours 20 percent more leukemia cells died than healthy cells but longer exposure to the radio waves triggered genes in the surviving cancer cells to divide aggressively.
The results of the study do not show any direct threat to human health but they support the belief of some scientists who say radiation can damage DNA and destroy the cell repair system, thus making tumors more deadly. But animal studies, including recent research by Australian scientists at the Institute of Medical and Veterinary Science in Adelaide, have shown that radiation from mobile phones does not trigger the growth of tumors.
The WHO (i. e. , The World Health Organization) has called for more research into the potential health hazards of mobile phones and has urged people to limit their use of them. A British government inquiry, which concluded that there was no evidence that mobile phones are a danger to health, has advised parents to discourage their children, whose brains are still developing, from using them excessively.
选项
A、1. 2 million.
B、1. 4 million.
C、0. 8 million.
D、2 million.
答案
C
解析
掌握数字信息,并能够作简单推算。
转载请注明原文地址:http://tihaiku.com/zcyy/3302479.html
相关试题推荐
Thescientistshaveabsolutefreedomastowhatresearchtheythinkitbestto__
Moreandmorevehiclesusingcheapfuel,declaredscientistsattheconference,
Toweakenthedamageforearthquakes,scientistsareworkingonwaystoenablea
Thescientistcontestedtheassumptionofpreviousscientiststhatthefateofh
Theanswerstotheproblem,thescientistssay,istobuilduptheimmunesystem
Scientistshaveclaimsthatthereisa______ofwildlifeintheAmazonRainFores
SARSisstilljeopardizingpeople’slivesbeforescientistscomeupwithaneffe
Followingthenewdiscovery,thescientistshadfinallyprecludedthedoubtson
Scientistsinvolvinginaseriousdebateabouthowtosolvetheproblemofgloba
Opponentsofgeneticengineeringclaimthatscientistsaretamperingwithmatter
随机试题
HowlongdidtheASEAN’sseparatesummitmeetinglast?[originaltext]Philipp
Suddenlysheturnedaroundand(catch)______sightofherboss.caught
OneofthemostwidelyabuseddrugsallovertheworldisAlcohol.Whathapp
使用柴油时不同牌号的柴油可以掺兑使用,并可根据气温情况酌情适当调配。()
患者女,23岁。未婚。不规则低热伴大、小关节疼痛月余。面部有较严重的蝶形红斑,怕
使用承租的机械设备和施工机具及配件的,由()验收合格后方可使用。A:由承租的施
工程设计工作一般划分为两个阶段,即()。A.初步设计和技术设计 B.技
()二级市场非常发达,交易方便,是商业银行证券投资的主要对象。A.记账式国
以下说法错误的是()。A.2010年1月的零售额增幅在12个月中是最小的
凡有创伤史者,遇有下列情况均应疑有腹内脏器损伤,除外A.伤后早期出现休克征象
最新回复
(
0
)