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
A
A考查形容詞短語和動詞詞義辨析。句意;豬的死亡率較低，且通常能在7至10天內(nèi)痊愈。依據(jù)語境，分析后句恢復(fù)較快，所以死亡率就不會很高，B,C前空不合適；occur發(fā)生，指時間短，突然之意符合句意。
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