In the space provided, write the letter of the pair of terms or phrases that best complete the analogy shown. An analogy is a relationship between two pairs of words or phrases written as a: b:: c: d. The symbol : is read “is to”, and the symbol:: is read “as.”
1. Wind power : renewable energy ::

a. Tidal power : geothermal energy

b. The sun : fuel cells

c. Hydrogen fuel : alternative energy

d. Biomass fuel : hydroelectric energy

2. Active solar heating : hot water ::

a. Photovoltaic cells : hot water ::

b. Passive solar heating : ethanol

c. Fuel cells : hybrid cars

d. energy conservation: fluorescent bulbs