The Economy Tomorrow on "Harnessing the Sun" states that the percentage of electricity that is generated from burning oil and coal is:
Less than 10%.
Between 10% and 30%.
Between 30% and 50%.
Greater than 50%.
2. The gap between exports and imports in a nation's economy is called the ___________.?
A) trade surplus
B) trade balance
C) trade deficit
D) trade inventory