题目选项分析

Although the hagfish secretes a small quantity of slime when threatened,it expands several hundred times as it absorbs seawater, forming a slime ball that can coat the gills of predatory fish and either suffocate them or distress them enough to make them flee.

Although the slime secreted by a threatened hagfish is small in quantity,it expands several hundred times as it absorbs seawater, forming a slime ball that can coat the gills of predatory fish and either suffocate them or distress them enough to make them flee.