首页
登录
职称英语
One of the major problems of nuclear energy is the inability of scientists to
One of the major problems of nuclear energy is the inability of scientists to
游客
2023-12-18
37
管理
问题
One of the major problems of nuclear energy is the inability of scientists to discover a safe way to dispose of the radioactive wastes which occur throughout the nuclear process. Many of these wastes remain dangerously active for tens of thousands of years, while others have a life span closer to a quarter of a million years. Various methods have been used to date, but all have revealed weaknesses, forcing scientists to continue their search.
The nuclear process involves several stages, with the danger of radioactivity constantly present. Fuel for nuclear reactors comes from uranium ore, which, when mined, spontaneously produces radioactive substances as by-products. This characteristic of uranium, ore went undetected for a long time, resulting in the deaths, due to cancer, of hundreds of uranium miners.
The United States attempted to bury much of its radioactive waste material in containers made of steel covered in concrete and capable of holding a million gallons. For a long time it was believed that the nuclear waste problem had been solved, until some of these tanks leaked, allowing the radioactive wastes to seep into the environment. Canada presently stores its nuclear waste in underwater tanks, with the long-term effects largely unknown.
However, plans are under consideration for above-ground storage of spent fuel from re- actors. These plans include the building of three vast concrete containers, which would be two stories high and approximately the length and width of two football fields. Other suggestions include enclosing the waste in glass blocks and storing them in underground caverns, or placing hot containers in the Antarctic region, where they would melt the ice, thereby sinking down about a mile. This idea has since been abandoned because of the possible adverse effect on the ice sheets. [br] According to passage, scientists failed to______.
选项
A、discover the characteristic of nuclear process
B、discover the nature of uranium ore
C、save the life of uranium miners
D、store nuclear wastes in underwater tanks
答案
B
解析
根据文章第二段最后一句“This characteristic of uranium ore went undetected for a long time,re suiting in the deaths,due to cancer,of hundreds of uranium miners.”就可知[B]为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3284575.html
相关试题推荐
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
Weallhaveproblemsandbarriersthatblockourprogressorpreventusfrom
随机试题
Formostpeoplewhohavesleepingtroubles,whichofthefollowingisthemostu
UNICEFisjoiningwithanonprofitgrouptobringAIDS【T1】______programsto
[audioFiles]audio_etoefz_019(20051)[/audioFiles]A、Classhasalreadystarted.B、
学校工作必须坚持“{}、全面安排”的原则。
Wearesurethathewillgetoverhisil
关于宫颈活组织检查,下列描述正确的是A.在宫颈外口鳞状上皮与柱状上皮交界处取材
测定固体废物易燃性是测定固体废物的:A.燃烧热 B.闪点 C.熔点 D.燃
从企业经营来看,资产负债率、负债与所有者权益比率越低越好。()
用横道图表示的建设工程进度计划,一般包括两个基本部分,即()。A.左侧的工作名称
下列关于光电感应式安全防护控制要求的说法正确的是( )。A.保护高度不低于滑块最
最新回复
(
0
)