【荆州专版】Unit 7 What's the highest mountain in the world？单元话题阅读与写作 习题课件

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单元话题阅读与写作
Unit　7　What's　the　highest　mountain　in　the　world ？
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Probably you have seen photos of the Grand
Canyon(科罗拉多大峡谷)，the great valley in the
desert country of Arizona.But you must go there
1.
yourself
(you)to feel its true size and
beauty.The
Grand Canyon
1S
one
of
the
2.
greatest
great)natural wonders of the
world.
The Colorado River formed the Grand Canyon
over millions of years ago.3.
Slowly (slow),
the river was cut down through the hard rock.At
the same time,the land was rising.Today the
canyon is 1.5 kilometers 4.
deep
and 445
kilometers long.The 5.
oldest
(old)
rocks at
the bottom of the canyon are more than 1 billion
years old.The width varies(变化)from about200
meters 6.
to
29 kilometers across.There are
different kinds of plants and animals on the sides
of the canyon.
The canyon looks different 7.
at
different
times of the day,and in different
seasons and
weather.At sunrise and sunset the red,gold,
brown and orange 8.
colors color)of the
rocks are especially clear and bright.In winter,the
canyon is partly 9.covered
cover with
snow.