20．A.none

　　B．all

　　C．anything

　　D．everything

　　答案：D　[It was nothing.And yet it was everything。此处无声胜有声。故选everything]

　　Ⅲ.任务型阅读

　　Each year a million cows in Africa die from east coast fever.The disease is spread by tick bites.Young cows are most at risk；they can die within days.Farmers and herders can lose up to half or more of their calves to east coast fever.

　　The disease is widespread in eleven countries.And experts say it now threatens ten million more animals in new areas including southern Sudan.

　　Researchers first developed an experimental vaccine against east coast fever thirty years ago.The vaccine works by a process called “infection and treatment”．The animals are infected with whole parasites and treated with antibiotics at the same time.This keeps the disease from developing.

　　Controlling east coast fever has meant a better life in areas that have gotten the vaccine.For example，the vaccine has been available for a group of Maasai herders in northern Tanzania for about seven years.They used to lose three­fourths of their newborn calves each year.Now，most survive.As a result，many people have extra cattle to sell，and use the money to pay for school for their children.

　　But making the vaccine more widely available—especially in rural areas—has been difficult.Farmers have been using supplies produced in the nineteen nineties.Recently there was a shortage.The International Livestock Research Institute made one million doses at the request of African officials.But that supply is only temporary.Another problem is that the vaccine must be kept extremely cold.

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