单项选择题

<上一题 目录 下一题>
热门 试题

单项选择题
A. The deposits aren’t made of organic material.B. The deposits aren’t found everywhere in the world.C. The deposits harden under conditions of heat and pressure.D. The deposits don’t form at regular time intervals.
A. The deposits aren’t made of organic material.
B. The deposits aren’t found everywhere in the world.
C. The deposits harden under conditions of heat and pressure.
D. The deposits don’t form at regular time intervals.
单项选择题
A. Three thousand years ago. B. When man began to salt fish. C. When man began to preserve the dead.D. Not mentioned.
A. Three thousand years ago. B. When man began to salt fish.
C. When man began to preserve the dead.D. Not mentioned.
相关试题