3．That_is_why pigeons have been used since ancient times to carry the news or even the mail.

　　这就是自古以来鸽子为什么被用来传递消息甚至是邮件的原因。

　　4．However，it was in war that they found their greatest use.然而，是在战争期间他们发现了它们的最大用途。

　　5．During both World War ⅠandⅡ，pigeons were employed by armies to carry messages to and from the front lines，saving_the_lives_of_many_soldiers_and_even_helping_win_some_important_victories.

　　在第一次世界大战和第二次世界大战期间，鸽子被军方用来和前线往返传递消息，挽救了许多士兵的生命，甚至帮助赢得了一些重要的胜利。

　　　阅读P18教材课文，选择最佳答案

　　1．Which of the following statements is TRUE about sharks?

　　A．Among the 400 different types of sharks, only about 40 types attack human beings.

　　B．The most fierce sharks are the tiger shark and the bull shark.

　　C．The shark's attack is the leading cause of people's death in the sea.

　　D．The chance of being attacked by sharks is rather small compared to other dangers.

　　2．Which of the following ways can help you out of the attacks from sharks?

　　A．Not swimming in the dark, especially alone at night.

　　B．The fewer people, the fewer chances to attract sharks.

　　C．Colorful or shining wears.

　　D．Swimming when you have a fresh wound.

　　3．________ is the way to save you out of a shark attack.

　　A．To keep still, not to stir or make the shark angry

　　B．To pull aside the shark's jaws to pull yourself out of its mouth

C．To hit the shark on the head to drive it away