A.Nuclear radiation can do little harm to human beings.
B.Nuclear radiation can do harm to human beings.
C.Nuclear radiation can be detected by human senses.
D.Nuclear radiation is just like common radio waves.
答案 B [由第一段,以及第三段第一、二、三句, 可知B正确,那么A就错了。根据第二段,可知C、D错误。]
3.How can nuclear radiation kill an animal?
A.By damaging its heart.
B.By killing a few cells in its body.
C.By hitting any place in its body.
D.By killing many cells in important organs.
答案 D [由第三段第一句,可知辐射通过大量破坏重要器官的细胞,导致动物死亡。]
4Nuclear radiation has a certain mystery because ________.
A.it can do harm to a person while the victim doesn't know
B.human beings learn its harmfulness
C.nuclear radiation can kill a person very easily
D.human beings have no effective machine to detect nuclear radiation
答案 A [由第二段第一句可知,辐射神秘之处在于,受害者在毫不知情的情况下就受到辐射的伤害了。]
.If a human being is hit by nuclear radiation, he may ________.
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