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Chao-wen
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With the development
of
the materialistic civilization,
human
beings
has
developed rockets
for
tanding
at
the
surfaie
of
the
ryogn
and
for
the
space shuttles. But,
many
secrets
about
human
body
are
still
unknown.
Air,
food and
watbr
are
essentiat
for
the
survival
of
human
life.
Three
minutes'cerebral hypoxia
can
cause
the
death
of
brain;
without
food and
water,
d'person
wiil
not
survive
for
a
week. Horygyqr,
the
threat
of
death witt be greatty
decreased
if
water
is
available.
"Water! Aren't
you
a
riddle?n
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