第18题: [单项选择]把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是( )。 A. ①②⑤,③④⑥ B. ①④⑥,②③⑤ C. ①③④,②⑤⑥ D. ①③⑤,②④⑥ 参考答案:B 答案解析:[解析] 本题考查的是图形的对称问题。根据各图中对称的方向可分为两类。在①④⑥中,对称轴为纵向;在②③⑤中,对称轴为横向。故选B。
第19题: [单项选择]Questions 26 to 29 are based on the passage you have just heard. A. Because they wanted to say hello to him. B. Because they wanted to offer some help. C. Because they came across an accident. D. Because they asked him for directions. 参考答案:B 答案解析:[听力原文] Why did people stop their car when the speaker was walking along the street 题目问为什么当作者在