53. Probably no man had more effect on the daily lives of most people in the Untied States than did Henry Ford a pioneer in automobile production.

　　54. The use of well-chosen nonsense words makes possible the testing of many basic hypotheses in the field of language learning.

　　55. The history of painting is a fascinating chain of events that probably began with the very first pictures ever made.

　　56. Perfectly matched pearls, strungsintosa necklace, bring a far higher price than the same pearls told individually.

　　57. During the eighteenth century, Little Turtle was chief of the Miami tribe whose territory became what is now Indiana and Ohio.

　　58. Among almost seven hundred species of bamboo, some are fully grown at less than a foot high, while others can grow three feet in twenty-four hours.

　　59. Before staring on a sea voyage, prudent navigators learn the sea charts, study the sailing directions, and memorize lighthouse locations to prepare themselves for any conditions they might encounter.

　　60. Of all the economically important plants, palms have been the least studied.

　　61. Buyers and sellers should be aware of new developments in technology can and does affect marketing activities.

　　62. The application of electronic controls made possible by the microprocessor and computer storage have multiplied the uses of the modern typewriter.

　　63. The human skeleton consists of more than two hundred bones bound together by tough and relatively inelastic connective tissues called ligaments.

　　64. The pigmentation of a pearl is influenced by the type of oyster in which it develops and by the depth, temperature, and the salt content of the water in which the oyster lives.

　　65. Although mockingbirds superbly mimic the songs and calls of many birds, they can nonetheless be quickly identified as mockingbirds by certain aural clues.

　　66. Not only can walking fish live out of water, but they can also travel short distances over land.

　　67. Scientists do not know why dinosaurs became extinct, but some theories postulate that changers in geography, climate, and sea levels were responsible.

　　68. The science of horticulture, in which the primary concerns are maximum yield and superior quality, utilizes information derived from other sciences.

　　69. Snow aids farmers by keeping heart in the lower ground levels, thereby saving the seeds from freezing.

　　70. Even though the precise qualities of hero in literary words may vary over time, the basic exemplary function of the hero seems to remain constant.

　　71. People in prehistoric times created paints by grinding materials such as plants and claysintospower and then adding water.

　　72. Often very annoying weeds, goldenrods crowd out less hardy plants and act as hosts to many insect pests.

　　73. Starting around 7000 B.C., and for the next four thousand years, much of the Northern Hemisphere experienced temperatures warmer than at present.

　　74. When Henry Ford first sought financial backing for making cars, the very notion of farmers and clerks owning automobiles was considered ridiculous.