题目

第二节：语法结构（共10小题；每小题1.5分，满分15分）              阅读下面短文，根据上下文填入适当的词语，或使用括号中的词语的适当形式 填空，并将答案填在答题卷标号为31~40的相应位置上。 CHILDREN AND GAMES        As we all know, games play a very important role in the growth of children. Children should grow along with playing games;   31           , through playing, they can not only acquire knowledge, but also cultivate their abilities to get along with others.        However, most以原点为极点，轴的非负半轴为极轴建立极坐标系，已知曲线的极坐标方程为：，在平面直角坐标系中，直线的方程为（为参数）．（1）求曲线和直线的直角坐标方程；（2）已知直线交曲线于，两点，求，两点的距离．