单项选择题
甲坛有8个小球，乙坛有4个小球，所有小球颜色各不相同，现从甲坛中取2个小球，乙坛中取1个小球，则取出3个球的不同取法共有（ ） A．224种 B．112种 C．32种 D．1320种
- A.224种
B.112种
C.32种
D.1320种
点击查看答案
相关考题
-
单项选择题
Deep inside a mountain near Sweetwater in East. Tennessee is a body of water known as the Lost Sea. It is listed by the Guinness Book of Would Records as the world’s largest underground lake. The Lost Sea is part of an extensive and historic cave system called Craighead Caverns. The caverns have been known and used since the days of the Cherokee Indian nation. The cave expands into a series of huge rooms from a small opening on the side of the mountain. Approximately one mile from the entrance, in a room called “The Council Room,” many Indian artisfacts have been found. Some of the items discovered include pottery, arrowheads, weapons, and jewelry. For many years there were persistent rumors of a large underground lake somewhere in a cave, but it was not discovered until 1905. In that year, a thirteen-year-old boy named Ben Sands crawled through a small opening three hundred feet underground. He found himself in a large cave half filled with water. Today tourists visit the Lost Sea and ride far out onto it in glass-bottomed boats powered by electric motors. More than thirteen acres of water have been mapped out so far and still no end to the lake has been found. Even though teams of divers have tried to explore the Lost Sea, the full extent of it is still unknown.The Lost Sea is unique because it is ________. A. part of a historical cave system B. the biggest underground lake in the world C. listed in the Guinness Book of World Records D. the largest body of water in Tennessee
A.
The -
未知题型
国家禁止进口（ ）A．犀牛角 B．天然砂 C．木炭 D．旧服装
A.犀牛角
B.天然砂
C.木炭
D.旧服装 -
单项选择题
Who located the Lost Sea in recent times? A. The Cherokee Indians. B. Tourists. C. Ben Sands. D. Scientists.
A.
