单项选择题

Questions 19 to 22 are based on the passage you have just heard.

A. Three thousand years ago. B. When man began to salt fish.
C. When man began to preserve the dead.D. Not mentioned.
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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. They’d have to get permission. B. Jack wouldn’t like it.C. He thinks it might work. D. The other assistants should be consulted.
A. They’d have to get permission.
B. Jack wouldn’t like it.
C. He thinks it might work.
D. The other assistants should be consulted.
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