内容正文:
118
Unit
7
单元综合自测 答案见193页(建议用时:40分钟)
Ⅰ./新课标·命运共同体 /
完形填空。(每小题1分,
共10分)
阅读下面短文,理解其大意,然后从各题所给的
四个选项中,选出可以填入空白处的最佳选项。
“Most
polar
bears
could
disappear
by
the
end
of
the
century
because
of
global(全球的)
warming,”
scientists
said.
According
to
a
study
in
Nature
Climate
Change,
the
number
of
polar
bears
wil
1
rapidly
by
2080.
There
are
two
reasons.
One
is
that
the
sea
ice
is
melting(融化).
Polar
bears
catch
seals(海豹)
to
eat
on
the
ice.
2
ice,
they
have
to
stay
on
land.
But
there
is
no
3
food
on
land
to
support
so
many
bears.
The
animals
could
die
from
hunger.
The
other
reason
is
that
mother
bears
may
not
be
fat
enough
to
4
milk
for
their
babies,
so
some
bears
could
stop
having
babies.
Polar
bears
are
5
land
animals
that
eat
meat
on
the
planet.
They
help
control
other
kinds
of
animals.
Losing
them
would
break
the
balance
of
their
living
place.
The
Arctic(北冰洋)
is
the
6
to
about
25,000
polar
bears.
Arctic
sea
ice
usualy
melts
in
spring
and
summer,
and
then
grows
in
winter.
But
now,
the
7
is
taking
longer
to
grow
back.
Scientists
said
the
Arctic
is
warming
twice
as
fast
as
the
rest
of
the
planet.
The
study
also
shows
8
it
is
possible
to
slow
Arctic
melting.
Greenhouse
gas(温室气体)
can
lead
to
climate
change.
Saving
the
bears
is
9
us.
One
of
the
writers
of
the
study
said,
“I
believe
there
is
hope,
but
humans
need
to
act
10
to
make
that
hope
come
true.”
Lets
take
action
to
protect
our
Earth
and
save
polar
bears.
( )1. A.develop B.fal
C.increase D.improve
( )2.A.Through B.Ac