题目：
36，5，1，
，
，（）。
A．
B．
C．
D．1
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B解析：根据Stokes公式，微粒的沉降速度与分散介质的黏度成反比，分散介质黏度减小，微粒沉降速度增加，混悬剂的物理稳定性降低。
36，5，1，，，（）。 A． B． C． D．1
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A NATIONWIDE BESTSELLER
It’s likely that everything you learned about America’s ancient history is wrong.
The new book,1491, completely changes our understanding of the America before the arrival of Columbus in 1492.
DID YOU KNOW?
When Columbus landed there were probably more people in the Americas than there were in Europe.
The peoples of North America had such healthy life-styles that as late as the 19th century they continued to be the tallest people on earth.
Facts have shown that the Americas were populated as long as 33,000 years ago. 4,000 years ago Mesoamerican farmers developed corn in a feat (技艺) of genetic engineering that still isn’t completely understood.
COMMENTS ON 1491
“In the tradition of Jared Diamond & John MePhee, a totally new view of pre-Columbian America”.
－Richard Rhodes
“Attractively written and really absorbing, Charles C.Mann has produced a book that’s part detective story, part epic(史诗) and part tragedy(悲剧). He has taken on a vast topic: thousands of years, two huge continents, and cultures.”
－Charles Matthews,San Jese Mercary News
“Powerful and challenging”
－Alan Taylor,Washingto post
“A pleasure to read as well as a wonderful education”
－Howard Zinn
小题1:On the whole,1491 is a book mainly about America’s________.
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B．population
C．history
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B．It is attractive and culturally related.
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A．people settled in the America a little earlier than 1492
B．North Americans were the tallest in the 18th century in the world
C．Mesoamencan farmers knew genetic engineering 5,000 years ago
D．the population in the Americas was smaller than that in Europe in 1492
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