[填空题]Four thousand species of dung beetle were initially brought to Australia by the CSIRO.

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How did they get there
Four men were sitting in a bar in London, having a drink. They were talking about dogs.
"If you want to buy a nice dog," said the first man. "One of my greyhounds is racing in Manchester this evening. Why don’ t you come and watch the race.’ If you like the dog, you can buy it."
"I’ll buy it if it wins the race," said the second man.
"And I’ll buy it if it loses the race," said the third man.
"My family won’t let me get a dog, but I’d like to come and see the race," said the fourth man.
They all went to Manchester to see the race, but they went there in different ways, the first man by car, the second man by plane, the third man by train and the fourth by bus.
To cut a long story short, the dog won the race, the second man bought the dog from the first man, and they went to a restaurant to celebrate.
While eat

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Four men were sitting in a bar in London, having a drink. They were talking about dogs.
"If you want to buy a nice dog," said the first man. "One of my greyhounds is racing in Manchester this evening. Why don’t you come and watch the race If you like the dog, you can buy it. "
"I’ 11 buy it if it wins the race," said the second man.
"And I’ 11 buy it if it loses the race," said the third man.
"My family won’ t let me get a dog, but I’ d like to come and see the race," said the fourth man.
They all went to Manchester to see the race, but they went there in different ways, the first man by car, the second man by plane, the third man by train and the fourth by bus.
To cut a long story short, the dog won the race; the second man bought the dog from the first man, and they went to a restaurant to c

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Four people were killed and more than fifty injured when fans rushed to get into a stadium in Chicago yesterday where a British pop group was giving its last concert in the city.
The incident occurred when the gate were opened to admit a huge crowd of young people waiting outside the stadium for the sale of unreserved seat tickets. People were knocked over in the rush. The injured were sent to the hospital immediately. But three, including a fourteen-year-old high school student, died on the way and one died this morning. Twenty have already left the hospital after regular medical check-up and treatment. Six are still under emergency treatment.
The pop group was unaware of what has happened and the concert later went ahead as planned. A police spokesman said that the police had decided to allow the concert to proceed in order to avoid further trouble, but they insisted the organizers of the concert be responsible for the incident.

A. Heavy fighting between rival fans caused deaths and injuries in a stadium.
B. Protest against police actions caused deaths and injuries outside a stadium.
C. A number of people were killed and injured because of disturbances during a pop concert.
D. A number of people were killed and injured when the stadium gates collapse