UNIT 7I. CHOOSE THE WORD OR PHRASE (A, B, C, D) THAT BEST FITS THE BLA...
23. _____ is a kind of fossil fuels, which is used for operating engine.
A. Iron
B. Silver
C. Gold
D. Petroleum
23. _____ is a kind of fossil fuels, which is used for operating engine.
A. Iron
B. Silver
C. Gold
D. Petroleum