----- Nội dung dịch tự động từ ảnh -----
15. The traffic
the street.
A. jams
B. signs
C. lights
D. rules
tell people to do, warns people about possible dangers
IV. Write the correct form of the words in brackets.
16. Our government has spent a lot of money on schools and
(HEALTH)
17. Do you like
18. I like solar energy because it is
19. A crazy cat and a
20. In the year 1905, astronauts
dog help him to find his parents. (FRIEND)
a life on this planet. (DISCOVERY)
V. Read the passage and choose the best option to answer each of the followi
questions.
by plane or by coach? (TRAVEL)
. (PLENTY)
Wind is a form of solar energy. Winds are caused by the uneven heating a
atmosphere by the sun. Wind flow patterns are changed by the earth's te
bodies of water, and vegetative cover. This wind flow, or motion energy,
"harvested" by modern wind turbines, can be used to generate electricity.
Wind turbines are available in a variety of sizes, and therefore power ratings
largest machine has blades that span more than the length of a football field, s
20 building stories high, and produces enough electricity to power 1,400 hom
small home-sized wind machine has rotors between 8 and 25 feet in diamete
stands upwards of 30 feet and can supply the power needs of an all-electric
or small business, utility scale turbines range in size from 50 to 750 kilo
Single small turbines, below 50 kilowatts, are used for homes, telecommunic
dishes, or water pumping.
21. What is the reason for the existence of wind?
A. atmosphere heated unevenly
B. wind flow
C. motion energy
D. wind turbines
22. Which of the following is NOT mentioned as a factor affecting the wind
direction?