问题
选择题
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
答案
答案：A
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。