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.
本文讲述了作为鱼饵被引入到美洲五大湖区的亚洲蚯蚓由于改变了当地的土壤环境,而影响当地植物的生长,破坏了生态环境。
. B.从开头作者就谈到把蚯蚓引到一个无蚯蚓生态区会对生活在那里的万物产生影响。第二段开头又提到。这种担心在五大湖区是显而易见的。因此作者字里行间流露出对亚洲蚯蚓带来的生态影响的担心。
. A.从第三段可知,在没有蚯蚓的森林中,落叶和动物尸体会堆积成腐殖层,它们是由细菌来分解成可供给植物来吸收的成分的。蚯蚓到来后,它们把地表的腐殖层(特点是:因为是落叶腐烂形成的,所以松软,植物容易扎根。)变成了肥沃的黑土,即第四段中所讲的the mineral soil(矿物质层)(特点是:因为被蚯蚓消化分解后的腐叶实质上已经变成了颗粒团状粪便,比腐殖质要有粘性,坚硬),从第四段最后两句可知,而这使得习惯了在腐殖质土层植根的当地植物很难在矿物质土层中扎根,植物不能很好的生长了,自然会导致生态系统的破坏。
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