A．Its enormous size.
B．Its plant-like appearance.
C．Its instantaneous response.
D．Its offensive smell.
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A．It helps improve their safety.
B．It allows them to swim faster.
C．It helps them fight their predators.
D．It allows them to avoid twists and turns.
A．In 28 states, from West Virginia in the east to Montana in the west.
B．In 27 states, from West Virginia in the west to Montana in the east.
C．In 27 states, from West Virginia in the east to Montana in the west.
D．In 28 states, from West Virginia in the west to Montana in the east.
A．gas-fired power plants.
B．coal-fired power plants.
C．water generated power plants.
D．wind-generated power plants.