That sounds great-but the local plants and animals in the Great Lakes region are used to living with the duff layer, not in the rich soil associated with earthworms. In addition, the rich top soil left by earthworms can wash out in a heavy rain. The differently produced soil is a problem as well. There’s a mat of fine roots in that duff layer-that’s where a lot of our native plants put their root system. When that duff is gone, it’s a lot harder for them to put their roots into the mineral（矿物质的）soil.

　　1. What is the author’s attitude towards the work of invasive earthworms ?

　　A. Supportive.

　　B. Worried.

　　C. Doubtful.

　　D. Respectful.

　　2. How does the Asian species affect the ecosystem of the Great Lakes Region?

　　A. By changing the soil.

　　B. By Killing the native species.

　　C. By eating the native plants.

　　D. By serving as fishing bait.

　　3. What does the last paragraph mainly talk about ________.

　　A. Asian earthworms’ work is helpful to the roots of the native plants.

　　B. The native plants have finally adapted to the rich black soil.

　　C. The Asian earthworms caused great problems for the local plants.

　　D. The local plants find it easy to put their roots into the mineral soil.

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