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单选题
In the conversion of the soil at the Hallside site, ______.
A
two types of worms are being used.
B
three types of worms are being used.
C
many types of worms are being used.
D
thousands of different types of worms are being used.
参考答案
参考解析
解析：
根据题干关键词conversion，Hallside site可定位到E段第二句“This will be converted into usable soil by about 21,000 Lubricus territories (garden lobworms) and Aporrectodea longa (black headed worms) that have been let loose on the site”，由此可知将这块土地转换成可用的土壤用到了两种蠕虫。所以正确答案为A。
根据题干关键词conversion，Hallside site可定位到E段第二句“This will be converted into usable soil by about 21,000 Lubricus territories (garden lobworms) and Aporrectodea longa (black headed worms) that have been let loose on the site”，由此可知将这块土地转换成可用的土壤用到了两种蠕虫。所以正确答案为A。
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