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How many people participate in the work of community theatres in the United States（）
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Passage 3Thousands of years ago, in the middle of an ocean, miles from the nearest island, an undersea volcano broke out. The hot liquid piled higher and higher and spread wider and wider. In this way, an island rose up in the sea.As time went on, hot sun and cool rains made the rock split and break to pieces. Sea waves dashed against the rock. In this way, soil and sand came into being.Nothing lived on the naked soil. And then the wind and birds brought plant seeds, spiders and other little creatures there. Only plants could grow first. Only they, in sunlight, could produce food from the minerals of the soil, water and air. While many animals landed on the island, they could find no food. A spider spun its web in vain, because there were no insects for its web to catch. Insects couldn’t stay until there were plants for them to eat. So plants had to be the pioneer life on this new island. According to the passage, which of the following is true（）
Passage 4Sports and games make our bodies strong, prevent us from getting too fat, and keep us healthy. But there are not their only use. They give us valuable practice in making eyes, brain and muscles work together. In tennis, our eyes see the ball coming, judge its speed and direction and pass this information on to the brain. The brain then has to decide what to do, and to send its orders to the muscles of the arms, legs, and so on, so that the ball is met and hit back where it ought to go. All this must happen with very great speed, and only those who have had a lot of practice at tennis can carry out this complicated chain of events successfully. For those who work with their brains most of the day, the practice of such skills is especially useful.Sports and games are also very useful for character-training. In their lessons at school, boys and girls may learn about such virtues as unselfishness, courage, discipline and love of one’s country; but what is learned in books cannot have the same deep effect on a child’s character as what is learned by experience. The ordinary day-school cannot give much practical training in living, because most of the pupils’ time is spent in classes, studying lessons. So it is what the pupils do in their spare time that really prepares them to take their place in society as citizens when they grow up. If each of them learns to work for his team and not for himself on the football field, he will later find it natural to work for the good of his country instead of only for his own benefit. What is of the greatest importance to a football team is （）
林辉在自助餐店就餐，他准备挑选三种肉类中的一种肉类，四种蔬菜中的二种不同蔬菜，以及四种点心中的一种点心。若不考虑食物的挑选次序，则他可以有多少不同选择方法（）。
案例分析题 有一位数学教师，在讲对数表一课时，先问学生一张纸厚度是0.083毫米，现在对折3次，厚度不足1毫米，如果对折30次，请同学估计一下厚度？学生：“30毫米”“60毫米”……！教师：“我经计算，这厚度将超过10座珠穆朗玛峰的叠起来的高度。”学生惊讶不已，甚至有人认为老师搞错了。教师列出式子：0.083×230，对学生说：230很难计算，不如查对数表。 试用学过的教学理论分析这位教师的教学策略。
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