43
the death of the person.
Cells in the body are growing
44
. As they wear
45
and disappear, their places are
46
by new cells of exactly the same kind. But cancer cells look and act
47
from normal body cells.
When these cancer cells divide and increase in
48
, they don’t change into the fully grown form and then stop reproducing.
49
they remain young cells and continue to reproduce in number until they are harmful.
As the cancer cells grow, they do not
50
in one spot, but separate and move in
51
the normal cells. They may become so
52
that the normal cells in this part of the body cannot continue to work or even remain alive. When the cancer
53
into the blood, it is carried to distant parts of the body.
54
it may grow to form large masses which interfere (干扰) with the activities of the
55
cells.
36. A. below
B. to
C. on
D. above
37. A. topics
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