题目内容
Strange things happen to time when you travel, because the earth is divided into twenty-four time zones, and one hour separate. You can have days with more or fewer than twenty-four hours, and weeks with more or fewer than seven days. If you make a five-day trip across the Atlantic Ocean, your ship enters a different time zone every day. As you enter each zone, the time changes one hour. Traveling west, you set your clock back; traveling east, you set it ahead. Each day of your trip has either twenty-five or twenty-three hours. If you travel by ship across the Pacific, yon cross the international date line. By agreement, this is the point where a new day begins. When you cross the line, you change your calendar one full day, backward or forward. Traveling east, today becomes yesterday; traveling west, it is tomorrow. According to the passage, it is believed that the Atlantic Ocean can be divided into ______ time zones.
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骨痂（）
公司的产品销量为20 000件，单价500元，固定成本总额为300万元，单位变动成本为200元，试计算其营业杠杆系数，并说明其含义。
（）是对教育专制性、等级化和特权化的否定．
There are many ways to learn about people of other lands. One way is to study the clothing other people wear. For thousands of years, people in different parts of the world have worn very different types of clothing. There are four big reasons for this. One reason might be religion. In many Moslem countries, women must wear veils to hide their faces. The veils must be worn in public. Veils are part of the Moslem religion. The second reason is that different materials are used in different countries. For instance, in France the materials used in clothing may be cotton(棉), silk, wool, or many other man-made materials. Most people in China wear cotton. The ways clothes are made are also very different. This is another reason why people dress differently. Western countries rely on machines to make most of their clothing. Someone living in India can use only hand power to make the clothing he needs. World-wide differences in customs also lead to differences in clothing. A Mexican farmer wears a straw hat with a brim(帽沿) up. In China, a farmer wears a straw hat with a brim down. Both hats are used to protect the farmers from the sun. Some of these customs have ’come down through thousands of years. The two examples of wearing hats are given in the last paragraph to show______.
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