The most common symptoms of cat heartworm disease are（）

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• Before developing into adults, the fourth-stage larvae of heartworm caninei migrate to the host’s（）
• Dogs raised indoors have a higher rate of the heartworm disease than that of dogs raised outdoors.
• Dogs with heartworm infection are often accompanied by nodular skin diseases.
• The number of papillae surrounding the mouth of the heartworm is（）