银杏：植物
A．椰子：椰树B．上海：中国C．熊猫：国宝D．熊猫：动物
参考答案：D
藻类主要包括哪些类群？
Which of the following is a form of man's habitat alteration
A．Glacial encroachment.
B．Hurricanes.
C．Dammed rivers.
D．Snowstorms.
