题目

在直角坐标平面内，与A、B两点距离等于1的直线至少有3条，则|AB|的取值范围是(    )A.［2，+∞)          B.(2,+∞)               C.(-∞,2)               D.(-∞,2］ 答案：解析：A、B两点在直线同侧或直线过AB的中点，当直线垂直于AB时，|AB|=2,∴|AB|≥2.答案：A 第二节 语法填空（共10小题，每小题1.5分，满分15分） 阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号为31-40的相应位置上。    Poor student behavior seems to be an ____31___ (increase) widespread problem and I think that modern lifestyles are probably responsible for this.    In many countries, the birth rate is decreasing so that families are smaller with ____32 children. These children are often spoilt, not in terms of love and attention because ____ 33 ___  (work) parents do not have the time for this, ____ 34 __ in more material ways. They are allowed to have ____ 35 __ they want, regardless of price, and to behave as they please. This means that the children grow up ____ 36 _ consideration for others and without any understanding of __37 __their standard of living comes from.    When they get to school age they have not learnt any self control or discipline. Teachers continually complain ____ 38 ____ this problem and measures ____ 39 ____ (take) to combat the situation. But I think the situation to the problem lies with the families, ____40 ____ need to be more aware of the future consequences of spoiling their children.