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[单选题]奇数与奇数的乘积一定是
A奇数
B偶数
C不确定
D负数
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57.试述新闻摄影的“瞬间”论。
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1. Strange thing happens to time when you travel. Because the earth is divided into twenty-four time zones one hour apart, 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 the hour. Travelling west, you set your clock back; travelling 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 you 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 the full day, backward or forward. Travelling east, today becomes yesterday; travelling west, it is tomorrow! 21. The best title for this selection is____.A. A Trip Across the Atlantic B. How Time Changes Around the World C. Crossing the International Date Line D. How Time Zones Were Set Up
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3.
私人产品即通过市场交换而获得的产品，其特点可概括为
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4.
经济危机爆发的根源是（ ）
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综合题(本大题共3小题，每小题5分，共15分。)
