Questions 21 to 23 are based on the following news.At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news. When the H5-N1 virus in humans was discovered in Hong Kong in 1997,A．the government has asked the U.N. agency to help contain the disease B．the government ordered all chickens in the city killed C．imports of birds from all over the world were suspended D．over a million chickens have either died from the flu or been culled
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