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洛基英语，免费体验全部在线一对一课程：
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Today, most
countries in the world have countries have built
canals near
the coast, and parallel 1
the in the twentieth century, goods can be moved
more cheaply by boat than by any other
2 of transport. These 3 make it possible for
boats
to
travel
4
ports
along
the
coast
without
being
5
to
the
dangers
of
the
open.
Some canals, such as the
Suez and the Panama, save ships weeks of time by
making
their 6 a thousand miles
shorter. Other canals permit boats to reach cities
that are not 7
on the coast, still
other canals 8 landsswheresthere is too much
water, help to 9 fields
wherethere is
not enough water, and 10 water power for factories
and size
of a canal 11 on the kind of
boats going through canal must be wide enough to
permit two of the largest boats using
it to 12 each other must be deep enough
to leave about two feet of water 13 the
keel of the largest boat using the
the
planet Mars was first 14 through a telescope,
people saw that the round disk of the
planet
was
criss-crossed
by
a
15
of
strange
blue-green
were
called
“
canals
”
16
they
looked
the
same
as
canals
on
earth
17
are
viewed
from
an
r,
scientists
are
now
18
that
the
Martian
phenomena
are
really
not
photographs
19 from space-ships have helped us to 20 the truth
about the
Martia
1.
2. ch
3. ays ronts ls
4. n
5. ed d
6. y
7. ned d
8.
9. te
10. h
11. s s
12.
e
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