单项选择题

A．From rocks in the mountain.
B．From the remains of ancient sea life.
C．From the soil under the sea.
D．From ancient trees.
<上一题 目录 下一题>
热门 试题

填空题
advantages
单项选择题
A．To demonstrate the latest use of computer graphics.B．To raise funds for public television programming.C．To explain the workings of the brain.D．To increase membership in professional medical societies.
A．To demonstrate the latest use of computer graphics.
B．To raise funds for public television programming.
C．To explain the workings of the brain.
D．To increase membership in professional medical societies.
相关试题