2014年托福高分写作范文.docx

最权威的台
2014 年托福高分写作X文
Sleet
is part
of a person ’s
daily activity
cycle.
There
are
several
different stages of sleep, and they too occur in cycles. If you are an
average sleeper, your
sleep
cycle is
as follows. When you
fist drift off
into slumber, your eyes
will
roll about
a bit,
you temperature will
drop
slightly,
your muscles will
relax,
and your breathing well
slow and become
quite
regular.
Your brain
waves slow and becomequite
regular.
Your brain
waves slow down a bit too, with the alpha rhythm of rather fast waves 1
sleep.
For the
next half
hour or
so,
as you relax
more and more, you will
drift
down through
stage 2 and stage 3 sleep.
The lower
your stage
of sleep.
Slower your brain
waves will
be. Then about 40to 69 minutes
after
you lose
consciousness
you will
have reached
the
deepest
sleep
of
all. Your
brain
will show the large slow waves that are known as the delta rhythm. This
is stage 4 sleep.
You do not remain at this
deep fourth
stage all
night long,
but instead
about 80 minutes after you fall into slumber, your brain activity level
will increase again slightly. The delta rhythm will disappear, to be
replaced by the activity
pattern of brain w