文档介绍：Unit 7
What's the highest mountain in the world?
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What’s the highest mountain in the world?
It’s ______________.
Qomolangma
Qomolangma is the highest mountain
in the world. It’s meters high.
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It’s ______________.
What’s the longest river in the world?
The Nile is the longest river in the world.
It’s 6,671 kilometers long.
The Nile
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It’s __________________.
The Caspian Sea
The Caspian Sea is the biggest lake in the world. It is 1,025 meters deep.
What’s the biggest lake in the world?
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It’s _____________.
What’s the biggest desert in the world?
The Sahara is the biggest desert in the world. It is about 9,600,000 square kilometers in size.
The Sahara
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Match the facts you know.
Qomolangma
about 9,600,000 square
kilometers in size
The Sahara
1,025 meters deep
The Caspian
Sea
6,671 kilometers long
The Nile
8, meters high
1a
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1. 形容词比较级和最高级
比较级在词尾加er 或词前加more;
最高级在词后加est或词前加most。
A与B相比更…
A + be + 形容词比较级 + than + B
A与B一样…
A + be + as +形容词原级 + as + B
A是…中最…
A + be + the +形容词最高级 + 范围
比较级前可用much, a little, even, far 等修饰。
不规则变化
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2. 数字表达法
英语中一千以上数字的表达方法是从数字的右端向左端数起，每三位数加一个逗号。从右开始，第一个逗号前数字后加thousand，第二个逗号前数字后加million，第三个逗号前数字后加billion，然后一节一节分别表示。
2648
16250064
5237166234
16, 250, 064
2,648
5, 237, 166, 234
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3. 英语表示 “有多长(宽，高…)”
一般将数词和数量单位放在表示长宽高的形容词前作状语，即
数词+ 数量单位(meters / kilometers) +长宽高 (long, wide ,high，…)
…米高（长，宽…)。
The wall is meters wide.
小数点读point.
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Listen and complete the sentences.
1. Qomolangma is __________ than any
other mountain in the world.
2. The Sahara is ____________ desert in
the world.
3. The Caspian Sea is ____________ of all
the salt lakes.
4. The Nile is __________river in the world.
higher
the biggest
the deepest
the longest
1b
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