The definitive host of Angiostrongylus cantonensis is（）

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• The intermediate host is not required for the development of Angiostrongylus cantonensis.
• Angiostrongylus cantonensis can invade the nervous system of humans and cause eosinophilic meningitis and meningoencephalitis.
• The infectious stage of Angiostrongylus cantonensis is（）
• Angiostrongylus cantonensis mainly distributed（）