higher animals also
A B C
have considerably problem-solving abilities.
D
40. Many of species of milkweed are among the most dangerous of poisonous plants, while others
A B C
have little, if any, toxicity.
D
Section Three: Reading Comprehension
Questions 1-10
In the early 1800’s, over 80 percent of the United States labor force was engaged
in agriculture. Sophisticated technology and machinery were virtually nonexistent.
People who lived in the cities and were not directly involved in trade often participated
Line in small cottage industries making handcrafted goods. Others cured meats, silversmiths, candle
5) or otherwise produced needed goods and commodities. Blacksmiths, silversmiths, candle
makers, and other artisans worked in their homes or barns, relying on help of family
Perhaps no single phenomenon brought more widespread and lasting change to the
United States society than the rise of industrialization. Industrial growth hinged on several
10） economic factors. First, industry requires an abundance of natural resources, especially
coal, iron ore, water, petroleum, and timber-all readily available on the North American
continent. Second, factories demand a large labor supply. Between the 1870’s and the
First World War (1914-1918), approximately 23 million immigrants streamed to the
United States, settled in cities, and went to work in factories and mines. They also helped
15）build the vast network of canals and railroads that crisscrossed the continent and linked
important trade centers essential to industrial growth.
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