题目内容

数学教学活动必须建立在学生的（）和已有（）的基础上，教师应激发学生的学习积极性，向学生提供充分从事数学（）的机会，帮助他们在自主探索和（）的过程中真正理解和掌握数学知识技能、数学思想和方法，获得广泛的数学活动经验．

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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.

A. 2
B. 3
C. 4
D. 5

骨痂（）

A. 最常见于腘窝
B. 因关节囊或腱鞘结缔组织发生黏液变性和液化所致
C. 关节滑膜细胞瘤样反应性增生，与局部损伤性出血有关
D. 起源于腱鞘滑膜组织，主要由组织细胞样滑膜细胞及由此融合的多核巨细胞组成
E. 成于成骨性肉芽组织

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．