A
:
Have
you
heard
about
the
fascinating
phenomenon
of
crop
circles
?
B
:
No
,
I
haven't
.
Please
tell
me
about
it
.
A
:
Sure
!
These
strange
circles
aren't
simply
circular
,
but
they
form
intricate
geometric
patterns
in
farm
fields
.
B
:
Do
you
know
what
____________________
____________________
the
explanation
for
this
phenomenon
?
A
:
Even
though
this
mystery
has
inspired
many
possible
explanations
over
the
years
,
crop
-
circle
enthusiasts
that
prefer
para
-
normal
explanations
for
the
circles
,
believe
they
____________________
____________________
messages
left
behind
by
extraterrestrial
visitors
.
B
:
But
I'm
sure
there
must
be
a
more
reliable
theory
.
A
:
Of
course
!
More
conventionally
scientific
-
minded
people
have
theorized
that
usually
these
circles
____________________
____________________
from
natural
physical
forces
,
such
as
wind
or
heat
.
B
:
It
seems
a
more
realistic
explanation
!
A
:
But
wait
!
There's
an
even
more
bizarre
explanation
:
wallabies
.
B
:
Wallabies
?
What
would
they
have
to
do
with
these
circles
?
A
:
According
to
Lara
Giddings
,
Attorney
General
for
the
Australian
state
of
Tasmania
,
the
wallabies
are
eating
poppies
in
fields
that
provide
legal
opium
for
morphine
and
painkillers
.
As
a
result
,
they
become
so
disoriented
that
they
run
around
in
the
fields
erratically
,
creating
paths
that
resemble
crop
circles
.
B
:
I
don't
know
.
I
think
the
suggestion
of
those
animals
being
the
cause
of
the
Australian
crop
circles
doesn't
really
explain
the
crop
-
circle
phenomenon
.
Wallabies
____________________
____________________
____________________
____________________
to
create
this
sort
of
intricate
geometric
patterns
present
in
most
crop
circles
.
A
:
And
there's
also
an
alternative
view
that
these
circles
are
nothing
more
than
elaborated
jokes
.
B
:
What
do
you
mean
?
A
:
Richard
Taylor
,
a
University
of
Oregon
physicist
has
been
studying
these
circles
.
He
recently
suggested
that
crop
-
circle
hoaxers
____________________
____________________
____________________
sophisticated
tools
such
as
GPS
devices
and
laser
pointers
to
burn
complex
patterns
in
the
fields
years
ago
.
Nevertheless
,
none
of
these
theories
has
been
proved
.
B
:
Well
,
I
would
dare
to
say
that
all
of
them
sound
completely
odd
and
bizarre
!
