lizzyboo32
lizzyboo32
18.03.2020 • 
English

17. The United States has a vast amount of newly discovered clean geothermal (natural heat from the
Earth's crust) energy. Tapping into this energy source could provide at least 10 times the energy that can be
obtained from the nation's known coal reserves.
What does "vast" mean?
A. a large amount
B. not enough
C. dangerous
D. having no known use

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