A．They characterize stages in Wright' s career.
B．Wright died while they were being constructed.
C．They were Wright' s earliest buildings.
D．They are examples of Wright's classical styles.
A．Theories of how the universe evolved.
B．Similarities between the planets in the solar system.
C．Reason for the high density of earth.
D．Theories of the origin of the Moon.
A．Earth and the Moon traveled at different speeds.
B．The Moon formed billions of years before Earth.
C．Earth did not have enough gravitational pull.
D．Earth and the Moon were too far from each other.