Nuclear power's danger to health, safety, and even to life itself can be summed up in one word: radiation.
Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It cannot be seen or heard, or touched or tasted, even though it is all around us. There are other things like that. Radio waves are all around us but we cannot detect them, sense them, without a radio receiver. Similarly, we cannot sense radioactivity without a radio detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other things.
At very high levels, radiation can kill an animal or human being outfight by killing masses of cells in vital organs. But even the lowest levels can do serious damage. There is no level of radiation that is completely safe. If the radiation does not hurt anything important, the damage may not be significant. This is the case when only a few are hit, and if they are killed outright, your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in a deformed way. They can grow into cancer. Sometimes this does not show up for many years.
This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can be radiated and feel fine, then die of cancer five, ten or twenty years later as a result.
Radiation can hurt us. We must know the troth.
The second paragraph tells us that ______.
A．nuclear radiation is invisible but harmful
B．nuclear radiation is detected only by a receiver
C．radio waves are harmless
D．radio waves are mysterious
相关问题推荐
-
What‘s the author‘s purpose of writing this passage? 查看材料
A. To emphasize that gravity is essential for us.
B. To explain what gravity is.
C. To advocate environmental protection.
D. To illustrate how gravity works.
-
As an excellent shooter, Peter practised aiming at both ________ targets and moving targets.
A) standing
B) stationary
C) still
D) stable
-
The ordinary family in colonial North America was primarily concerned with sheer physical survival and beyond that, is own economic prosperity. Thus, children were valued in terms of their productivity, and they assumed the role of producer quite early. Until they fulfilled this role, their position in the structure of the family was one of subordination and their psychological needs and capacities received little consideration. As the society became more complex, the status of children in the family and in the society became more important. In the complex, technological society that the United States has become, each member must fulfill a number of personal and occupational roles and be in constant contact with a great many other members. Consequently, viewing children as potentially acceptable and necessarily multifaceted members of society means that they are regarded more as people in their own right than as utilitarian organisms. This acceptance of children as equal participants in the contemporary family is reflected in the variety of statutes protecting the rights of children and in the social and public welfare programs devoted exclusively to their well-being. This new view of children and the increasing contact between the members of society has also resulted in a surge of interest in child-rearing techniques. People today spend a considerable portion of their time conferring on the proper way to bring up children. It is now possible to influence the details of the socialization of another person's child by spreading the gospel of current and fashionable theories and methods of child rearing. The socialization of the contemporary child in the United States is a two-way transaction between parent and child rather than a one-way, parent-to-child training program. As a consequence, socializing children and living with them over a long period time is for parents a mixture of pleasure, satisfaction, and problems.
Which of the following would be the best title for the passage?
A．The Place of Children in United States Society
B．The Children of Colonial North American
C．The Development of Cultural Values
D．The Child as a Utilitarian Organism
-
According to the passage, anthropologists believe that human beings ________.
A．have some traits in common
B．are born with diverse cultures
C．are born without a fixed nature
D．change their characters as they grow up
-
如何平衡工作责任和个人兴趣
For this part， you are allowed 30 minutes to write an essay on how to balance job responsibilities and personal interests。 You should write at least 150 words but no more than 200 words。