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红细胞大小差异最明显的是
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33（）
Passage Three In the 1840s, the Mormons (摩门教信徒), who are a religious group, travelled west searching for a new home. Many Mormons lived in the state of Illinois, but they had been badly treated and finally were forced to leave. As the Mormons travelled through the desert, they became discouraged. Then they saw a strange tree. The tree’s branches stretched out like arms. The Mormons thought the tree looked like Joshua, a hero from the Bible. The Mormons thought the arms of the tree were telling them to continue on their way; so they did. They found a new home in what is now the state of Utah. In Utah they saw trees like the one in the desert. They called them "Joshua trees." The Joshua tree was very useful. The Native Americans of the West used almost all its parts. They ate not only the fruit of the tree, but also its seeds and white blossoms. They used its leaves for shoes. From its roots they made baskets and got colours for their clothes. Settlers in the West used the Joshua tree for firewood and fences. Unfortunately, they often needed to cut down the trees. Some of the trees were as tall as 50 feet (15.6 metres). These trees were 700 or 800 years old. The Joshua tree grows very slowly. It grows only about one inch (2.54 centimetres) a year. By the beginning of the 1900s, most Joshua trees had been cut down. People were sad that this strange tree had almost disappeared. In 1936, the Joshua Tree National Park was established in California. It has many kinds of interesting desert plants, including, of course, many Joshua trees. None of these Joshua trees are 50 feet. But perhaps some day they will be. In the thirties of twentieth century, people established the Joshua Tree National Park in order to （）.
结合 【18】 和 【19】 的思想构成了现在大部分信息系统开发方法的理论基础，如结构化生命周期方法。
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