共用题干

共用题干
第三篇

Nuclear Power and Its Danger

Nuclear power's danger to health,safety,and even life itself can be summed up in one word:radia-
tion.
Nuclear radiation has a certain mystery about it,partly because it canhot be detected by human senses.
It can't be seen or heard,or touched,or tasted,even though it may be all around us.There are other
things like that.For example,radio waves are all around us but we can't detect them,sense them,without a
radio receiver. Similarly,we can't sense radioactivity without a radiation detector. But unlike common radio
waves,nuclear radiation is not harmless to human beings and other living things.
At very high levels,radiation can kill an animal or human being outright by killing masses of cells in
vital organs.But even the lowest level of radiation can do serious damage.There is no level of radiation that
is completely safe.If the radiation does not hit anything important,the damage may not be significant. This
is the case when only a few cells 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 irradiated and feel
fine,then die of cancer five,ten,or twenty years later as a result.Or a child can be born weak or liable to
serious illness as result of radiation absorbed by its grandparents.
Radiation can hurt us.We must know the truth.

Radiation can cause serious consequences even at the lowest level___________.
A:when it kills few cells
B:if it damages few cells
C:though the damaged cells can repair themselves
D:unless the damaged cells can reproduce themselves