根据短文理解，从A、B、C三个选项中选择最佳答案填空。

    A young father was visiting an old man. They were standing in the old man's garden and  1  children. The young man said, "How strict should parents be  2their children?" The old man pointed to a line3 a big, strong tree and a thin, 4  one. "Please untie the line," he said. The young man 5 so, and the young tree bent(弯曲) over to one side.

    "Now tie it again," said the old man, "but first pull the line tight(紧紧地) so that the young tree is6  again." The young man did as the old man told him. Then the old man said, "It is the same with  7  . You must be strict with them, but sometimes you must untie the 1ine8 how they are getting on. If they are not yet able to stand alone, you must tie the line tight 9 . But when you find that they are ready to stand alone, you can take the10   away."

依次填入下面文段横线处的语句，衔接最恰当的一组是（    ）

信息时代给人们带来了一种新的极其便捷的阅读方式，那就是网络阅读。网络阅读远远超越了传统的阅读概念，_____，_____，_____，_____，_____，_____。因此，阅读的趣味性大大提高，吸引力更强，影响力更大。

• ①能够对文字、图片、影像、声音等信息形态进行有机的合成
• ②能够更好地满足人们沟通交流的需求
• ③与传统阅读相比，信息更加全面，视野更加开阔，也更直观、更逼真
• ④提供读、看、听三方面的内容
• ⑤它改变了单一的文字或静态的图像的表现形式

⑥ 还具有共享性、开放性和互动性

下列说法中正确的有（　　）

①位似图形都相似；

②两个等腰三角形一定相似；

③两个相似多边形的面积比为4：9，则周长的比为16：81；

④若一个三角形的三边分别比另一个三角形的三边长2cm，那么这两个三角形一定相似．