TEXT A
Horses are used in guarding herbs, carrying men in lands where there are no roads, and helping farmers work their land. Pigeons have long been used to carry messages. Wild animals from the jungles, forests and seas are very popular performers in circuses and moving pictures. People realize that, although animals may not have the same intellgence as human beings, they are smart enough to know certain things.
Horses are also able to learn many things. Homes that are used for guard or police duty must learn never to be frightened of noises, traffic, and other disturbances. Racing horses are able to run much faster than other horses, but they are also quite high strong. Therefore, it is necessary for those people who train them to be very patient and understanding.
Pigeons have a natural instinct to return home, even if they are very far away and the trip is hard or dangerous. Men utilize this homing instinct to send messages on small p
A. 75 mph
B. 50 mph
C. 110 mph
D. 62 mph
The agriculture revolution in the nineteenth century involved two things: the invention of labor-saving machinery and the development of scientific agriculture. Labor-saving machinery naturally appeared first where labor was scarce. "In Europe", said Thomas Jefferson, "the object is to make the most of their land, labor being sufficient; here it is to make the most of our labor, land being abundant". It was in America, therefore, that the great advances in nineteenth-century agricultural machinery first came. At the opening of the century, with the exception of a crude (粗糙的) plow, farmers could have carried practically all of the existing agricultural tools on their backs. By 1860, most of the machinery in use today had been designed in an early form. The most important of the early inventions was the iron plow. As early as 1890 Charles New bolt of New Jersey had been working on the idea of a cast-iron plow and spent his entire fortune in introdu
A. Europe
B. America
C. New Jersey
D. Indiana
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