These measures may seem slow and difficult but they are still preferable to commercial slug repellents (驱虫剂) for several reasons. The topsoil of a garden is often highly lacking in nutrients, due to chemical damage caused by just such products. The fertilizer industry sells millions of pounds of dirt mixed with the nutrients necessary for a healthy garden every year. Yet these are the very same minerals that a healthy slug population would provide at no cost. Moreover, since slugs find newly dead slugs highly appetizing. the slug population is unlikely to decrease significantly as a result of these severe measures.
63.According to the passage, the wise way to deal with slug problem is that we should _
A.apply as many kinds of commercial repellents as possible to the plant roots
B.sacrifice some plants and keep semi-decayed plant matter as food for slugs
C.employ all possible gardening techniques to get rid of slugs completely
D.protect the garden from slugs by keeping it in a clean and tidy state
64.Commercial slug repellents are not advisable, because they__
A.do chemical harm to the top soil of a garden
B.make chemical fertilizers not so effective
C.make products not so healthy for eating
D.they help slugs reproduce more quickly
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