九年级英语第二十单元

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People who go up into high mountains often get dizzy. Breathing the thin air makes them dizzy.
A man is flaying more than 15,ooo feet above the sea. The air is very thin. Is the man dizzy? No. He is breathing oxygen from a tank.
In south America, Indians live far up on the mountains. Their homes are more than 15,000 feet above the sea. The Indians are not breathing oxygen from a tank. But they do not get dizzy. They have lived in these mountains all their lives. Their lungs have changed. They have become large. The large lungs help the Indians breathe the thin air.
Sometimes the Indians go down to the low country, People living down there feel fine. But the Indians feel sick.
( )1.What does the sentence “The higher the air goes up, the thinner it gets.”mean?
A.It means that you can get thin air when you are tall enough.
B.It means that the air in a high place is as thin as that in a low place.
C.It means that the air vecomes thinner in a higher place.

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www.yf1234.com ( )2.Why so people often get dizzy when they go up ;into high mountains?
A.Because they are too tired./
B.Because there is less oxygen in the air.
C.Because their lungs becomes smaller.
( )3.Mountain Indians can breathe thin air because______.
A.they have larger lungs than common people.
B.they need less oxygen than common people.
C.they are much stronger than common people
( )4.From the passage we know_____.
A.it is hard for all the people to breathe thin air.
B.it is hard for Indians to breathe thin air.
C.it is hard for those who live in lower places to breathe thin air.
( )5.The main idea of this passage is _______.
A.people get used to the air where they live
B.air is very important
C.the Indians who live in high mountains.
(CBACA)
　

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九年级英语第二十单元