The dead rate is _____ pigs and recovery usually ______ within 7-10 days.A.low in; occursB.rich in;happensC.high in; came aboutD.poor in;took place
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A解析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。