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VI. READING
1. Read the passage and choose the best answer.
Wind is a form of solar energy. Winds are caused by the uneven heating of the
atmosphere by the sun. Wind flow patterns are changed by the earth's terrain, bodies of
water, and vegetative cover. This wind flow, or motion energy, when "harvested" by
modern wind turbines, can be used to generate electricity.
Wind turbines are available in a variety of sizes, and therefore power ratings. The
largest machine has blades that span more than the length of a football field, stands 20
building stories high, and produces enough electricity to power 1,400 homes. A small
home-sized wind machine has rotors between 8 and 25 feet in diameter and stands
upwards of 30 feet, and can supply the power needs of an all-electric home or small
business, utilityscale turbines range in size from 50 to 750 kilowatts. Single small
turbines, below 50 kilowatts, are used for homes, telecommunications dishes, or water
pumping.
1. What is the reason for the existence of wind?
A atmosphere heated unevenly
C. motion energy
boog ba
A
B. wind flow
D. wind turbines
2. Which of the following is NOT mentioned as a factor affecting the wind direction?
A. earth's terrain B. bodies of water C. vegetative cover D. the Sun
3.The word "variety" is closest in meaning with
A. capacity
B. popularity
C. diversity
4. What is the height of the largest wind turbines?
A. as tall as a 20 story building
C. 30 feet
D. minority
B. between 8 and 25 feet
D. 50 feet
B. a small business C. 400 homes
5. A small home-sized wind machine can produce enough power for
A. 20 buildings
D. a football field