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　The Australian government（政府）has built the longest fence（篱笆）in the world. It is 9, 500 kilometres long, and two hundred men look after it. They drive along it and repair it every day. Sand blows against it and covers it. Sand blows away from it and leaves holes under it. 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. Dingoes are wild dogs. They are the fiercest (最凶猛) killers in Australia. Wild animals usually kill for food--but dingoes kill for pleasure, too. One dingo can easily kill 100 sheep in a night. Dingoes killed 600,000 sheep in Queensland in eleven years. Those sheep were worth $2,000,000. The farmers were angry, but they could not stop the dingoes. The problem was too big for the farmers to solve. So the government agreed to build the fence. Why? Because Australia depends on her sheep. She exports (出口) 45 percent of all the wool (羊毛) in the world. She mustwin the fight against the dingoes.

1. Why did the Australian government build the world's longest fence? 

[　　　　 ]

A． To match the Great Wall in China.

B．To protect sheep from being killed by dingoes.

C．To hold wind and sand.

2．Why are the holes in the fence dangerous and should be repaired immediately?

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A． The fence will fall.

B．The fence might appear ugly with those holes.

C．Dingoes will get through these holes to kill sheep.

3． What are dingoes?　　　

[　　]

A． The passage doesn't explain.

B．They are wild dogs that are the fiercest killers in Australia.

C． They are Australian sheep.

4． Why are dingoes known as the fiercest killers in Australia?　　　

[　　]

A． Dingoes are big-eaters, they kill a lot of sheep for food.

B．Even the farmers can't defeat them and get them killed.

C．They kill not only for food but also for pleasure.

5．What is Australia famous for?　　　

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A．The world's longest fence.

B． The fiercest killer--dingoes.

C．Her sheep and wool.

6．The fence is 　　　 long.　　　

[　　]

A． 9,500 kilometres

B． 100 kilometres

C．600,000 kilometres

D．2,000,000 kilometres

7． 　　　 dingo can easily kill 　　　 sheep in a night.　　　

[　　]

A． 1; 100

B． 11; 600,000

C．200; 2,000,000

8． Of all the wool in the world, 　　　 comes from Australia.　　　

[　　]

A． 50%

B．55%

C．45%

9．The problem was too big for the farmers to solve. It means that 　　　

［　　］

A．When the farmers tried to solve the problem, they found it very difficult.

B．the problem was important but difficult. To solve such a problem is beyond（超出）the farmers' ability（能力）.

C． the problem was very important and the farmers solved it (with the help of the government).

10． In the last sentence, what does "she" refer to（指）?　　　

[　　]

A．The farmer

B．The sheep

C． Australia