The propellors are large,to obtain energy from the largest possible volume of air.The blades can be angled to cope with varying wind speeds.Some designs use vertical turbines (垂直涡轮机),which don’t need to be turned to face the wind.The towers are tall,to get the propellors as high as possible,up to where the wind is stronger.This means that the land beneath can still be used for farming.
66.The first paragraph aims to introduce to us________.
A.the function of wind power
B.the source of wind power
C.the nations using wind power
D.the history of using wind power
67.How does a wind power work?
A.The generator turns the propeller blades and produce electricity.
B.The tall tower helps turn the energy in the air into electricity.
C.Warm air rises and makes the propellor move round.
D.The propellor blown round by wind turns the generator to produce electricity.
68.The best places for building the wind farm are places where______.
A.boats and caravans can often be seen
B.isolated farms don’t have enough electricity
C.there are less human activities
D.the wind is strong and reliable
69.We can infer from the passage that________.
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