SAVING ENERGY PRACTICE TEST 1I. CHOOSE THE WORD OR PHRASE THAT...

49. - 200 CAU TRAC NGHIEM KQ ANH 9 -BAI 6-7
200 CAU TRAC NGHIEM KQ ANH 9 -BAI 6-7

49. Which is NOT mentioned in the passage as an alternative source of energy?

a. Burning garbage b. Geothemal power

c. Synthetic fuels

d. Electricity