在△ABC中，BC=15cm，CA=45cm，AB=57cm，另一个和它相似的三角形的最短边长是5cm，则最长边长是（　　）

    Have you seen the cartoons of two penguins(企鹅) on the Internet? They sit on either side of a small1 They are friends, but each does something selfish（自私的）which 2 their friend “ship” to sink(沉没).

    The cartoons have become very 3. It shows how much people value friendship and sometimes 4they may lose their friends. A friend is someone you can share your happy and5 moments with. A friend is someone to talk to about your deepest feelings. And with a good friend you will never be alone.

    However, keeping friendship isn't always 6. The key to7 your friend “ship” from sinking comes down to three simple things: sharing, caring and communicating.  Good friends like to share everything with each other. They share their snacks, they share their8 about schoolwork, sometimes they even share their clothes! And good friends also care about each other. They do9 they can to make their friends happy. But the most important part of friendship is communicating.

    Communicating means talking to your friends and being honest with them. It also means that you keep in touch with your friends even though they may be in10 schools or live far away. Without communication, it is sure to send your friend “ship” to sink into the sea.