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【单选题】
某农户使役牛，饲喂草料不够，牛舍环境较差，且在农忙期使役过度，农忙结束该牛检查患结核病，该病发生的主要原因是A.
饲养环境不良
B.
营养不良
C.
结核菌感染
D.
过度劳累
E.
病毒感染
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【简答题】Dear Alice, How are you ? I’m in a new school this term . This school is big and nice . There are aout 1,400students in my school. I like the teachers. They are all kind tome . My classmates are polit...
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