单项选择题
A．in express B．to expressing C．in expressing D．to express
A．traditional beliefs among people living in different areas B．results of certain study on people living in different climate zones C．belief that has no longer accepted by most of people D．study done by Ellsworth Huntington alone
A．create a botanical garden where only exotic flowers grow B．do a thorough study of plant structure C．make a copy of one member of each United States flower family D．show that glass flowers are more realistic than wax flowers