答案:A
19.A.diploma
B.permission
C.identity
D.attitude
解析:与辍学者相对比的应该是拥有高中文凭的人。
答案:A
20.A.briefly
B.slightly
C.early
D.particularly
解析:辍学者比别人早离开学校。
答案:C
三、阅读理解
Under the cold clear water of Lake Huron,researchers have found a fiveandahalffootlong piece of wood that is 8, 900 years old.The wood,which is tapered(使成锥形)on one side in a way that looks deliberate,may provide important clues to a mysterious period in North American prehistory.
“This was the stage when humans gradually shifted from hunting large animals to fishing,gathering and agriculture,”said anthropologist John O’Shea.“But because most of the places in this area that prehistoric people lived in are now under water,we don’t have good evidence of this important shift itself.We just have clues from before and after the change.”
With support from the National Science Foundation(NSF)and the National Oceanic and Atmospheric Administration(NOAA),O’Shea and his colleague Guy Meadows began exploring the area several years ago.In 2009 they reported finding a series of stone features that they believe were“drive lanes”used by ancient Indian hunters.
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