The primary purpose of obedience training is to ______.
A.teach the dog to perform. clever tricks
B.make the dog aware of its owner's authority
C.provide the dog with outlets for its wild behavior
D.enable the dog to regain its normal behavior
第3题
持续性大便隐血试验阳性考虑诊断为
A、胃炎
B、胃癌
C、胃溃疡
D、十二指肠球部溃疡
E、胃泌素瘤
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