A、Leaving slugs partially unharmed could provide a more cost－efficient way to fertilize a garden.
B、Slugs, although potentially beneficial, are so damaging that they deserve to be exterminated.
C、Gardeners should never use toxic chemical any sort in their gardens.
D、Commercially sold slug repellents are highly effective.
E、Essential plant nutrients can be found only in slug trails.
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试题解析
文中作者提到鼻涕虫能为土壤免费地提供养分，而使用化肥和鼻涕虫诱饵会花费很多。
