Four tobacco plant seeds found in an ancient Utah fireplace suggest early Americans might have been using the plant 12，300 years ago.The finding makes the first known use of tobacco some 9，000 years earlier than previously thought Researchers believe hunter-gatherers in the Great Salt Lake Desert may have smoked wads of the plant.Until now，the earliest evidence of tobacco use was a 3，300-year-old smoking pipe discovered in Alabama.
   Archaeologists discovered the millimetre-wide seeds at the Wishbone site，an ancient camp in the desert in what is now northern Utah.There，they found the rest of an ancient hearth（壁爐地面）that was surrounded by bone and stone artefacts（手工藝品）.
   Their findings suggest the native American hunter-gatherers may have consumed the tobacco while cooking or toolmaking，the scientists say in a paper published in the journal Nature Human Behaviour.
   The tobacco plant is native to the Americas and contains the psychoactive addictive sub-stance nicotine（尼古丁）.Tobacco was widely cultivated and spread around the world following the arrival of Europeans in the Americas at the end of the 15th century. "The tobacco seeds were the big surprise.They are incredibly small and rare to be preserved，" said Daron Duke，a researcher of the Far Western Anthropological Research Group. "Today，the Great Salt Lake Desert is a large dry lake.But 12，300 years ago，the camp would have been on a vast marshland.We know very little about their culture.The thing that interests me most about this find is the social window it gives to a simple activity in an undocumented past.My imagination runs wild."

（1）What does the finding suggest in paragraph 1？

C

C

A．Americans prefer using smoking pipes.
B．Tobacco plants can easily be found around America.
C．Americans have a longer history of tobacco use than we thought.
D．Tobacco plants were introduced into America 9，000 years ago.
（2）What did archaeologists find at the ancient camp？

D

D

A．Some animal meat.
B．A rich farming land.
C．A modern hunting tool.
D．Small tobacco seeds.
（3）What can we learn from paragraph 4？

B

B

A．Tobacco was first planted in America by Europeans.
B．Europeans contributed to the spread of tobacco.
C．Americans started learning to smoke in the 1500s.
D．People cared about the effects of smoking.
（4）What did Daron Duke think of the discovery of tobacco seeds？

A

A

A．Amazing.
B．Threatening.
C．Alarming.
D．Satisfying.