Which of the following explanations is given by Jerry Hayes to the phenomenon?
A.Bee-keepers do not understand the honeybee's behavior.
B.A certain type of chemical destroys the honeybee's nervous system.
C.Honeybees are infected by unwanted insects.
D.Some crops are poisonous to the honeybees.
第4题
环磷酰胺用于治疗
A.出血性膀胱炎
B.心脏毒性
C.溶血性尿毒症
D.肺纤维化
E.过敏反应
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