内容正文:
题型组合提升练十七
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Ⅰ.阅读理解
Kids
everywhere
love
to
play.
And
they
know
that
a
bal
is
a
perfect
thing
to
play
with.
Now
scientists
report
bumblebees(大 黄 蜂)seem
to
know
the
same
thing,
making
bumblebees
the
first
insects
known
to
play.
Lots
of
animals
play.
But
the
behavior
is
best
known
in
mammals(哺 乳 动 物)
and
birds.
For
many
animals,
playing
is
often
seen
as
a
kind
of
training
for
things
theyl
have
to
deal
with
in
later
life.
But
before
this,
there
were
no
reports
of
insects
playing.
Dr.
Lars
Chittka
did
an
earlier
experiment,
where
he
trained
bumblebees
to
rol
bals
into
a
goal
for
food.
He
noticed
some
bees
were
roling
bals
even
when
they
werent
rewarded.
He
wondered
if
they
were
playing.
To
test
the
idea,he
with
other
scientists
set
up
a
new
experiment.
First,
they
marked
45
young
bumblebees,
both
male
and
female,
between
one
and
23
days
old.
Then
they
set
up
a
clear
pathway
from
the
bumblebees
nest
to
a
feeding
area.
On
either
side
of
the
open
pathway,
smal
colored
wooden
bals
were
placed.
On
one
side
of
the
path,
the
bals
couldnt
move.
On
the
other
side,
the
bals
could
rol
around.
For
three
hours
a
day
over
14
days,
the
scientists
opened
the
pathway.
The
bumblebees
never
had
to
leave
the
pathway
to
find
food,
but
they
left
anyway.
They
werent
so
interested
in
the
side
where
the
bals
couldnt
move,
but
they
made
lots
of
visits
to
the
side
with
the
roling
bals.
Grabbing
the
bals
with
their
legs,
the
bumblebees
would
beat
their
wings
to
pul
on
the