請依下文回答第 16 題至第 20 題       There are many amazing underground creatures. The stars of the underground show are earthworms,__16__ their role in building soil, their importance to gardeners, and the fascination they afford schoolchildren.Earthworms are giants compared with most other soil__17__ . The earthworm’s body is made of__18__ cylinders, which look like many little rings joined together. They are__19__ that chew their way throughsoil, feeding on plant and animal detritus and on microbes, digesting and thoroughly mixing organic andinorganic components before eliminating it as humus. This__20__breaks complex organic molecules downinto simpler forms more suitable for uptake by plants.
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(A) because of
(B) soon after
(C) despite of
(D) right after