31. The Huichol dont use electricity because
A. it is too difficult for them to change their lifestyle
B. they know nothing about it
C. it costs too much to string power lines
D. they dont need it
32.To make a living,the Huichol create artwork and
A.sell it in cities far away from their villages.
B.sell it to tourists in their villages.
C.display it in their village museum.
D.keep it in their homes to attract tourists.
33.The central part of the Portable Lights technology is
A.Glass Bulbs.
B.HB LEDs.
C.digital clocks.
D.incandescent lights.
34. All of the following are disadvantage of incandescent lights EXPECT
A. they burn out quickly
B. they are easily broken
C. they are not bright enough.
D. they waste most of the energy produced
35.LEDs are different from light bulbs in that
A.LEDs can send out light of different colors.
B.LEDs are made up of tiny pieces of rock.
C.LEDs belong to incandescent lights.
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