The dead rate is pigs and recovery usually within 7-10 days. A low in; occursB.rich in;h

发布时间：2020-08-17 11:30:57

The dead rate is      pigs and recovery usually      within 7-10 days.
A low in; occurs                           B.rich in;happens
C.high in; came about                      D.poor in;took place

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解析：A考查形容词短语和动词词义辨析。句意;猪的死亡率较低，且通常能在7至10天内痊愈。依据语境，分析后句恢复较快，所以死亡率就不会很高，B,C前空不合适；occur发生，指时间短，突然之意符合句意。
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