填空题
Feline leukemia may be contributing to ______ (豹类数量的减少).
【参考答案】
the decline of the leopard population
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填空题
It is possible that the virus can jump species, ______ (但是没有理由担心它会感染人类).
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A moratorium has been placed on ______ (政府用于克隆技术研究的款项).
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