The Australian government has built the longest fence in the world. It is 9,500 kilometers long, and two hundred men look after it. They repair it every day. Rabbits make holes through it. These holes are dangerous. The men have to repair them immediately. If they do not, the dingoes will get in. They are the fiercest killers in Australia. Dingoes killed 600,000 sheep in Queensland in eleven years. The farmers were angry, but the problem was too big for them to solve. So the government agreed to build the fence.

(91 words)

　　Which of the following is the best title of the passage?
　　 A) Dingoes.
　　 B) The longest fence in the world.
　　 C) Fighting against the dingoes.　　
　　 D) Looking after the longest fence in the world.

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