单项选择题
A．how an undersea volcano broke out B．how an island rose up in the sea C．how soil was formed on a new island D．how life began on a volcano-produced island
A. hidden B. new C. mysterious D. bare
A．Spiders were the first life that could live on the island. B．The island is far away from any piece of land. C．Insects could not live on the island without plants. D．Plants were brought to the island by human beings.